
MITSUBISHI MICROCOMPUTERS
M37207MF-XXXSP/FP, M37207M8-XXXSP
M37207EFSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
and ON-SCREEN DISPLAY CONTROLLER
27
Fig. 20. Serial I/O Mode Register
Fig. 21. Serial I/O Control Register
b7b6 b5b4b3 b2b1b0
Serial I/O mode register (SM) [Address 00DE
16
]
B
Name
Functions
After reset
R W
0
Serial I/O Mode Register
0, 1 Internal synchronous
clock selection bits
(SM0, SM1)
(See note 1)
b1 b0
0 0: f(X
IN
)/4 or f(X
CIN
)/4
0 1: f(X
IN
)/16 or f(X
CIN
)/16
1 0: f(X
IN
)/32 or f(X
CIN
)/32
1 1: f(X
IN
)/64 or f(X
CIN
)/64
2
Synchronous clock
selection bit (SM2)
3, 7 Ports P4
0
, P4
1
function selection
bits (SM3, SM7)
(See note 2)
P4
0
/S
OUT2
/
SDA3/X
CIN
P4
0
S
OUT2
SDA3
P4
2
/S
IN2
/
SDA2/AD8
P4
2
SDA2
P4
2
SDA2
0: External clock
1: Internal clock
0
0
R W
R W
R W
4, 6 Ports P4
2
, P4
3
function selection bits
(SM4, SM6)
(See note 2)
5
Transfer direction
selection bit (SM5)
0: LSB first
1: MSB first
0
R W
P4
1
/S
CLK2
/
SCL3/X
COUT
P4
1
S
CLK2
SCL3
P4
3
/S
RDY2
/
SCL2/AD7
P4
3
b7
0
1
b6
b3
0
1
0
R W
S
RDY2
SDA2
0
1
0
1
b4
0
1
Notes 1:
Either f(X
IN
) or f(X
CIN
) is selected by bit 7 of the CPU
mode register.
2:
When using ports P4
0
–P4
3
as serial I/O pins, set bit 1 of
the serial control register to “1.”
b7b6 b5b4b3 b2b1b0
Serial I/O control register (SIC) [Address 0207
16
]
B
0
Name
Functions
After reset
R W
0
Serial I/O Control Register
Input signal to sift
register selection bit
(SIC0)
CSIO b0
0 0: Input signal from S
IN1
0 1: Input signal from S
OUT1
(See note 1)
1 0: Input signal from S
IN2
1 1: Input signal from S
OUT2
(See note 1)
1
Serial I/O pin switch
bit (CSIO)
I
2
C-BUS connection
ports switch bit
(SIC2)
0:
S
OUT1
,
S
CLK1
,
S
IN1
,
S
RDY1
1:
S
OUT2
,
S
CLK2
,
S
IN2
,
S
RDY2
0:
SDA2, SCL2, SDA1, SCL1
1:
SDA3, SCL3
0
R W
R W
Notes 1:
When inputting data from the S
out
pin, set “FF
16
” to the serial
I/O register.
2:
When using ports P4
4
–P4
7
as serial I/O pins, set bit 1 of the
serial I/O control register to “0.”
3, 7 Ports P4
7
function
selection bits
(SM3, SM7)
(See note 2)
P4
7
/S
RDY1
/PWM8
P4
7
S
RDY1
PWM8
0
R W
4, 5 Ports P4
4
, P4
5
function selection bits
(SM4, SM6)
(See note 2)
6
Ports P4
6
function
selection bits
(SIC6)
(See note 2)
b7
0
1
b3
0
1
P4
4
/S
OUT1
/
SDA1
P4
4
S
OUT1
SDA1
P4
6
/S
IN1
/PWM9
0
R W
P4
5
/S
CLK1
/
SCL1
P4
5
S
CLK1
SCL1
b5
0
1
b4
0
1
P4
6
PWM9
0
R W
b6
0
1
2
0
R W