HD643303x Hitachi, HD643303x Datasheet - Page 523

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

TCSR—Timer Control/Status Register
Bit
Initial value
Read/Write
Note:
Overflow flag
0 [Clearing condition]
1 [Setting condition]
Timer mode select
Read OVF when OVF = 1, then write 0 in OVF
TCNT changes from H'FF to H'00
0 Interval timer: requests interval timer interrupts
1 Watchdog timer: generates a reset signal
*
Timer enable
Only 0 can be written, to clear the flag.
0 Timer disabled
1 Timer enabled
•
•
•
TCNT is initialized to H'00 and halted
TCNT is counting
CPU interrupt requests are enabled
R/(W)
OVF
7
0
*
WT/
R/W
6
0
IT
TME
R/W
5
0
508
—
—
4
1
—
—
3
1
Clock select 2 to 0
0
1
H'A8
CKS2
R/W
2
0
0
1
0
1
CKS1
R/W
1
0
0
1
0
1
0
1
0
1
ø/2
ø/32
ø/64
ø/128
ø/256
ø/512
ø/2048
ø/4096
CKS0
R/W
0
0
WDT