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Serial I/O Mode Register
b7 b6 b5 b4 b3 b2 b1 b0
Fig. 6.7.12 Serial I/O mode register
0
Serial I/O mode register (SM) [Address 00DC
B
Name
0, 1 Internal synchronous
clock selection bits
(SM0, SM1)
Synchronous clock
2
selection bit (SM2)
Serial I/O port
3
selection bit (SM3)
4
Fix this bit to "0."
Transfer direction
5
selection bit (SM5)
6
Serial input pin
selection bit (SM6)
Nothing is assigned. This bit is a write disable bit.
7
When this bit is read out, the value is "0."
7220 Group User's Manual
]
16
Functions
b1 b0
0
0: f(X
)/4
IN
0
1: f(X
)/16
IN
1
0: f(X
)/32
IN
1
1: f(X
)/64
IN
0: External clock
1: Internal clock
0: P2
, P2
functions
0
1
as port
1: S
, S
CLK
OUT
0: LSB first
1: MSB first
0: Input signal from S
pin
IN
1: Input signal from S
pin
OUT
APPENDIX
6.7 Control registers
After reset R W
0
R W
0
R W
0
R W
0
R W
0
R W
0
R W
0
R —
Address 00DC
16
6-37
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