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ii EPSON S1C88650 TECHNICAL MANUAL
CONTENTS
5.3 Watchdog Timer................................................................................................................39
5.3.1 Configuration of watchdog timer ............................................................................................ 39
5.3.2 Interrupt function ....................................................................................................................39
5.3.3 Control of watchdog timer ...................................................................................................... 40
5.3.4 Programming notes .................................................................................................................40
5.4 Oscillation Circuits ...........................................................................................................41
5.4.1 Configuration of oscillation circuits .......................................................................................41
5.4.2 Mask option .............................................................................................................................41
5.4.3 OSC1 oscillation circuit .......................................................................................................... 41
5.4.4 OSC3 oscillation circuit .......................................................................................................... 42
5.4.5 Switching the CPU clocks .......................................................................................................42
5.4.6 Control of oscillation circuit ................................................................................................... 43
5.4.7 Programming notes .................................................................................................................43
5.5 Input Ports (K ports) .........................................................................................................44
5.5.1 Configuration of input ports.................................................................................................... 44
5.5.2 Mask option .............................................................................................................................44
5.5.3 Pull-up control ........................................................................................................................45
5.5.4 Interrupt function and input comparison register ...................................................................45
5.5.5 Control of input ports .............................................................................................................. 47
5.5.6 Programming notes .................................................................................................................50
5.6 Output Ports (R ports) ......................................................................................................51
5.6.1 Configuration of output ports.................................................................................................. 51
5.6.2 High impedance control ..........................................................................................................51
5.6.3 DC output ................................................................................................................................ 51
5.6.4 Control of output ports ............................................................................................................ 52
5.7 I/O Ports (P ports) ............................................................................................................54
5.7.1 Configuration of I/O ports....................................................................................................... 54
5.7.2 Mask option .............................................................................................................................54
5.7.3 I/O control registers and I/O mode .........................................................................................54
5.7.4 Pull-up control ........................................................................................................................55
5.7.5 Special output .......................................................................................................................... 55
5.7.6 Control of I/O ports .................................................................................................................57
5.7.7 Programming notes .................................................................................................................60
5.8 Serial Interface .................................................................................................................61
5.8.1 Configuration of serial interface .............................................................................................61
5.8.2 Switching of terminal functions ...............................................................................................61
5.8.3 Transfer modes ........................................................................................................................ 62
5.8.4 Clock source ............................................................................................................................ 63
5.8.5 Transmit-receive control ......................................................................................................... 64
5.8.6 Operation of clock synchronous transfer ................................................................................ 65
5.8.7 Operation of asynchronous transfer ....................................................................................... 69
5.8.8 Interrupt function ....................................................................................................................73
5.8.9 Control of serial interface ....................................................................................................... 75
5.8.10 Programming notes ............................................................................................................... 80
5.9 Clock Timer.......................................................................................................................81
5.9.1 Configuration of clock timer ...................................................................................................81
5.9.2 Interrupt function ....................................................................................................................81
5.9.3 Control of clock timer ............................................................................................................. 83
5.9.4 Programming notes .................................................................................................................85
5.10 Programmable Timer........................................................................................................86
5.10.1 Configuration of programmable timer .................................................................................. 86
5.10.2 Operation mode .....................................................................................................................87
5.10.3 Setting of input clock .............................................................................................................89
5.10.4 Operation and control of timer ............................................................................................. 89
5.10.5 Interrupt function .................................................................................................................. 91
5.10.6 Setting of TOUT output ......................................................................................................... 93
5.10.7 Transfer rate setting of serial interface................................................................................. 94