M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
Serial I/O Mode Register
b7b6 b5b4b3 b2b1b0
0
Serial I/O mode register (SM) [Address 00DC16
]
B
Name Functions
R W
R W
After reset
b1 b0
0, 1 Internal synchronous
clock selection bits
(SM0, SM1)
0
0 0: f(XIN)/4
0 1: f(XIN)/16
1 0: f(XIN)/32
1 1: f(XIN)/64
0
0
R W
R W
2
3
0: External clock
1: Internal clock
Synchronous clock
selection bit (SM2)
Serial I/O port
selection bit (SM3)
0: P2
0
, P2
1
1: SCLK,
S
OUT
0
0
R
4
5
Fix this bit to “0.”
W
R W
R W
0: LSB first
1: MSB first
Transfer direction
selection bit (SM5)
Serial input pin
selection bit (SM6)
0: Input signal from SIN pin.
1: Input signal from SOUT pin.
0
0
6
7
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
—
R
Fig. 8.5.3 Serial I/O Mode Register
Rev.1.00 Oct 01, 2002 page 29 of 110
REJ03B0134-0100Z
RENESAS [ RENESAS TECHNOLOGY CORP ]
