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Philips Semiconductors
User’s Manual - Preliminary -
P89LPC906/907/908
Table of Contents
2003 Dec 8 3
6. Real-Time Clock/System Timer............................................................ 47
Real-time Clock Source........................................................................... 47
Changing RTCS1-0 ................................................................................. 50
Real-time Clock Interrupt/Wake Up ......................................................... 50
Reset Sources Affecting the Real-time Clock.......................................... 50
7. Power Monitoring Functions ................................................................. 53
Brownout Detection ................................................................................. 53
Power-On Detection ................................................................................ 54
Power Reduction Modes.......................................................................... 54
8. UART (P89LPC907, P89LPC908)........................................................ 59
Mode 0..................................................................................................... 59
Mode 1..................................................................................................... 59
Mode 2..................................................................................................... 59
Mode 3..................................................................................................... 59
SFR Space .............................................................................................. 60
Baud Rate Generator and Selection........................................................ 60
Updating the BRGR1 and BRGR0 SFRs................................................. 60
Framing Error........................................................................................... 61
Break Detect............................................................................................ 61
More About UART Mode 0 ...................................................................... 63
More About UART Mode 1 ...................................................................... 64
More About UART Modes 2 and 3........................................................... 65
Framing Error and RI in Modes 2 and 3 with SM2 = 1 ............................ 65
Break Detect............................................................................................ 65
Double Buffering...................................................................................... 66
Double Buffering in Different Modes........................................................ 66
Transmit Interrupts with Double Buffering Enabled (Modes 1, 2 and 3) .. 66
The 9th Bit (Bit 8) in Double Buffering (Modes 1, 2 and 3)...................... 67
Multiprocessor Communications.............................................................. 68
Automatic Address Recognition............................................................... 68
9. Reset .................................................................................................... 71
Power-On reset code execution .............................................................. 71
10. Analog Comparators........................................................................... 73
Comparator Configuration ....................................................................... 73
Internal Reference Voltage...................................................................... 74
Comparator Interrupt ............................................................................... 74
Comparator and Power Reduction Modes............................................... 74
Comparator Configuration Example ........................................................ 75
11. Keypad Interrupt (KBI)........................................................................ 77
12. Watchdog Timer ................................................................................. 79
Watchdog Function.................................................................................. 79
Feed Sequence ....................................................................................... 80
Watchdog Timer in Timer Mode .............................................................. 83