SH7055S Datasheet, PDF (488/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

• Bits 1 and 0—Clock Select 1 and 0 (CKS1, CKS0): These bits select the clock input to
CMCNT from among the four internal clocks obtained by dividing the peripheral clock (Pφ).
When the STR bit of CMSTR is set to 1, CMCNT begins incrementing with the clock selected
by CKS1 and CKS0.
Bit 1: CKS1
0
1
Bit 0: CKS0
0
1
0
1
Description
Pφ/8
Pφ/32
Pφ/128
Pφ/512
(Initial value)
14.2.3 Compare Match Timer Counter (CMCNT)
The compare match timer counter (CMCNT) is a 16-bit register used as an up-counter for
generating interrupt requests.
When an internal clock is selected with the CKS1 and CKS0 bits of the CMCSR register and the
STR bit of CMSTR is set to 1, CMCNT begins incrementing with that clock. When the CMCNT
value matches that of the compare match timer constant register (CMCOR), CMCNT is cleared to
H'0000 and the CMF flag of CMCSR is set to 1. If the CMIE bit of CMCSR is set to 1 at this time,
a compare match interrupt (CMI) is requested.
CMCNT is initialized to H'0000 by a power-on reset and in the standby modes. It is not initialized
by a manual reset.
Bit: 15
14
13
12
11
10
9
8
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
Bit: 7
6
5
4
3
2
1
0
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
Rev.2.0, 07/03, page 450 of 960