3069RF-ZTAT Datasheet, PDF (911/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

TCSR—Timer Control/Status Register
H'FFF8C
WDT
Bit
7
6
5
4
OVF
WT/16
TME
Initial value
0
0
0
1
Read/Write R/(W)*
R/W
R/W
3
2
1
0
CKS2
CKS1
CKS0
1
0
0
0
R/W
R/W
R/W
Clock select 2 to 0
CKS2 CKS1 CKS0 Description
0 φ/2
0
1 φ/32
0
0 φ/64
1
1 φ/128
0 φ/256
0
1 φ/512
1
0 φ/2048
1
1 φ/4096
Timer enable
Timer disabled
0 • TCNT is initialized to H'00 and
halted
Timer enabled
1
• TCNT is counting
Timer mode select
Interval timer:
0 _{requests interval timer interrupts}
Watchdog timer:
1 _{generates a reset signal}
Overflow flag
[Clearing condition]
0 Read OVF when OVF = 1, then write 0 in OVF
[Setting condition]
1
TCNT changes from H'FF to H'00
Note: * Only 0 can be written, to clear the flag.
Rev. 5.0, 09/04, page 889 of 978