M37281EKSP Datasheet, PDF (157/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
Address 021316
Serial I/O Mode Register
b7 b6 b5 b4 b3 b2 b1 b0
Serial I/O mode register (SM) [Address 021316]
B
Name
0, 1 Internal synchronous
clock selection bits
(SM0, SM1)
Functions
b1 b0
0 0: f(XIN)/8 or f(XCIN)/8
0 1: f(XIN)/16 or f(XCIN)/16
1 0: f(XIN)/32 or f(XCIN)/32
1 1: f(XIN)/64 or f(XCIN)/64
After reset R W
0
RW
2 ^{Synchronous clock}
selection bit (SM2)
3 Port function
selection bit (SM3)
0: External clock
1: Internal clock
0: P11, P13
1: SCL1, SDA1
0
RW
0
RW
4 Port function
selection bit (SM4)
5 Transfer direction
selection bit (SM5)
0: P12, P14
1: SCL2, SDA2
0: Transfer from the last significant
bit (LSB)
1: Transfer from the top significant
bit (MSB)
0
RW
0
RW
6 ^{SIN pin switch bit}
(SM6)
0: P17 is SIN pin
1: P72 is SIN pin
7 ^{Nothing is assigned. This bit is a write disable bit.}
When this bit is read out, the value is “0.”
0
RW
0
R—
Rev.1.01 2003.07.16 page 157 of 170