7220 Datasheet, PDF (266/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
6.7 Control registers
Timer 34 Mode Register
b7 b6 b5 b4 b3 b2 b1 b0
Timer 34 mode register (T34M) [Address 00F516]
B
Name
0 Timer 3 count source
selection bit (T34M0)
1 Timer 4 internal count
source selection bit
(T34M1)
Functions
0: f(XIN)/16
1: External clock
0: Timer 3 overflow
1: f(XIN)/16
After reset R W
0 RW
0 RW
2 Timer 3 count
stop bit (T34M2)
3 ^{Timer 4 count stop}
bit (T34M3)
0: Count start
1: Count stop
0: Count start
1: Count stop
0 RW
0 RW
4 ^{Timer 4 count source} 0: Internal clock
selection bit (T34M4) _{1: f(XIN)/2}
0 RW
5 ^{Timer 3 external count}
0: External clock from P2 3/TIM3 pin 0 R W
source selection bit (T34M5) _{1: External clock from H SYNC pin}
6,7 Nothing is assigned. These bits are write disable
bits. When these bits are read out, the values are
“0.”
0 R—
Fig. 6.7.25 Timer 34 mode register
Address 00F516
Interrupt Input Polarity Register
b7 b6 b5 b4 b3 b2 b1 b0
0
00
Interrupt input polarity register(RE) [Address 00F9 16]
b
Name
Functions
0 Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
1, 2 Fix these bits to “0.”
3 INT1 polarity switch bit
(RE3)
0 : Positive polarity
1 : Negative polarity
4 INT2 polarity switch bit
(RE4)
5 INT3 polarity switch bit
(RE5)
0 : Positive polarity
1 : Negative polarity
0 : Positive polarity
1 : Negative polarity
6 Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
7 Fix this bit to “0.”
After reset R W
Indeterminate R —
0
RW
0
RW
0
RW
0
RW
0
R—
0
RW
Fig. 6.7.26 Interrupt input polarity register
Address 00F916
7220 Group User’s Manual
6-47