3069RF-ZTAT Datasheet, PDF (464/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

12.2.2 Timer Control/Status Register (TCSR)
TCSR is an 8-bit readable and writable register. Its functions include selecting the timer mode
and clock source.
Bit
7
6
5
4
OVF WT/IT 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
These bits select the
TCNT clock source
Reserved bits
Timer enable
Selects whether TCNT runs or halts
Timer mode select
Selects the mode
Overflow flag
Status flag indicating overflow
Notes: TCSR is write-protected by a password. For details see section 12.2.4, Notes on Register
Access.
* Only 0 can be written, to clear the flag.
Bits 7 to 5 are initialized to 0 by a reset and in standby mode. Bits 2 to 0 are initialized to 0 by a
reset. In software standby mode bits 2 to 0 are not initialized, but retain their previous values.
Rev. 5.0, 09/04, page 442 of 978