MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
Interrupt Input Polarity Register
b7 b6 b5 b4 b3 b2 b1 b0
0
0
0
0
Interrupt input polarity register (IP) [Address 021216]
B
Name
Functions
After reset
0
R
R
W
W
0 to 2,
5
Fix these bits to “0.”
0
0
0
R
R
R
W
W
W
3
4
6
INT1 polarity switch bit
(INT1POL)
0 : Positive polarity
1 : Negative polarity
INT2 polarity switch bit
(INT2POL)
0 : Positive polarity
1 : Negative polarity
INT3 polarity switch bit
(INT3POL)
0 : Positive polarity
1 : Negative polarity
0
R
W
7
A-D conversion • INT3
interrupt source selection
bit (RE7)
0 : Positive polarity
1 : Negative polarity
Interrupt Input Polarity Register
Address 021216
Serial I/O Mode Register
b7b6 b5b4b3 b2b1b0
0 0
Serial I/O mode register (SM) [Address 021316
]
B
Name
Functions
R W
R W
After reset
Internal synchronous
clock selection bits
(SM0, SM1)
0, 1
0
b1 b0
0
0
1
1
0: f(XIN)/4 or f(XCIN)/4
1: f(XIN)/16 or f(XCIN)/16
0: f(XIN)/32 or f(XCIN)/32
1: f(XIN)/64 or f(XCIN)/64
Synchronous clock
selection bit (SM2)
0
0
R W
R W
2
3
0: External clock
1: Internal clock
Port function
0: P1
1, P13
selection bit (SM3)
1: SCL1, SDA1
Port function
selection bit (SM4)
0: P1
1: SCL2, SDA2
2
, P1
4
0
0
R W
R W
4
5
0: LSB first
1: MSB first
Transfer direction
selection bit (SM5)
Fix these bits to “0.”
0
R W
6, 7
Serial I/O Mode Register
Address 021316
139
RENESAS [ RENESAS TECHNOLOGY CORP ]
