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Serial Interface
13-6
13.2.3 Description of Registers for the General-Purpose Serial Interface
The general-purpose serial interface includes the registers listed in Table 13-2-1. These registers are used for
settings such as clock source selection, parity bit selection, and protocol selection.
Table 13-2-1 List of General-Purpose Serial Interface Registers
Address Name Symbol
Number of bits
Initial value Access size
x'34000800 Serial 0 control register SC0CTR 16 x'0000 8, 16
x'34000804 Serial 0 interrupt mode register SC0ICR 8 x'00 8
x'34000808 Serial 0 transmission buffer SC0TXB 8 x'00 8
x'34000809 Serial 0 reception buffer SC0RXB 8 x'00 8
x'3400080C Serial 0 status register SC0STR 16 x'0000 8, 16
Serial 0 control register
Register symbol: SC0CTR
Address: x'34000800
Purpose: This register sets the serial interface 0 operation control conditions.
Bit No.1514131211109876543210
Bit SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0 SC0
name TXE RXE BKE IIC MD1 MD0 OD TOE CLN PB2 PB1 PB0 STB CK2 CK1 CK0
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Access R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit No. Bit name Description
0 SC0CK0 Clock source selection (LSB)
1 SC0CK1 Clock source selection
2 SC0CK2 Clock source selection (MSB)
000: 1/2 IOCLK (valid only in clock synchronous mode)
001: 1/8 IOCLK
010: 1/32 IOCLK
011: 1/2 timer 9 underflow (valid only in clock synchronous mode)
100: 1/8 timer 3 underflow
101: 1/8 timer 9 underflow
110: 1/8 external clock (valid only in UART mode)
111: External clock (valid only in clock synchronous mode)
3 SC0STB Stop bit selection (valid only in UART mode)
0: 1 bit 1: 2 bits
4 SC0PB0 Parity bit selection (LSB)
5 SC0PB1 Parity bit selection