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CHAPTER 19 SERIAL INTERFACE CHANNEL 2
65432107
Symbol
CSIM2 CSIE2 0 0 0 0
CSIM
22
CSCK 0
CSCK
0
1
Serial Operating Mode Selection
UART mode
3-wire serial I/O mode
CSIM22
0
1
First Bit Specification
MSB
LSB
CSIE2
0
1
Operation Control in 3-wire Serial I/O Mode
Operation stopped
Operation enabled
FF72H 00H R/W
Address After Reset R/W
19.4.2 Asynchronous serial interface (UART) mode
In this mode, one byte of data is transmitted/received following the start bit, and full-duplex operation is possible.
A dedicated UART baud rate generator is incorporated, allowing communication over a wide range of baud rates.
In addition, the baud rate can be defined by scaling the input clock to the ASCK pin.
The MIDI standard baud rate (31.25 kbps) can be used by employing the dedicated UART baud rate generator.
(1) Register setting
The UART mode is set by the serial operating mode register 2 (CSIM2), asynchronous serial interface mode
register (ASIM), asynchronous serial interface status register (ASIS), and baud rate generator control register
(BRGC).
(a) Serial operating mode register 2 (CSIM2)
CSIM2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM2 to 00H.
When the UART mode is selected, 00H should be set in CSIM2.
Caution Ensure that bits 0 and 3 to 6 are set to 0.