CHAPTER 13 SERIAL INTERFACE 20
User’s Manual U13045EJ2V0UM00
164
Figure 13-1. Serial Interface 20 Block Diagram
Note
See Figure 13-2 for the configuration of the baud rate generator.
Internal bus
Receive buffer
register 20 (RXB20)
Switching of the first bit
Asynchronous serial
interface status register 20
(ASIS20)
(ASIM20)
Serial operation mode
register 20 (CSIM20)
Receive shift
register 20 (RXS20)
CSIE20 SSE20 DAP20 DIR20 CSCK20 CKP20
PE20
FE20 OVE20
TXE20 RXE20 PS201 PS200 CL20 SL20
Asynchronous serial
interface mode register 20
Transmit shift
register 20 (TXS20)
Transmit
shift clock
Selector
CSIE20
DAP20
Data phase
control
Reception
shift clock
SI20/P22/
RxD20
SO20/P21/
TxD20
4
Parity operation
Stop bit addition
Reception data counter
Parity operation
Stop bit addition
Transmission data counter
SL20, CL20, PS200, PS201
Reception enabled
Reception clock
Detection clock
Start bit
detection
Port mode
register (PM21)
CSIE20
CSCK20
SCK20/P20/
ASCK20
SS20/P23/
CPT20/INTP0
Clock phase
control
Reception detected
Internal clock output
External clock input
Transmission
and reception
clock control
Baud rate
generator note
4
TPS203 TPS202 TPS201 TPS200
CSIE20
CSCK20
f
X
/2 to f
X
/2
8
Baud rate generator
control register 20 (BRGC20)
INTST20
INTSR20/INTCSI20
Internal bus
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