Rev. 2.00, 09/03, page 325 of 690
13.2.2
Compare Match Timer Control/Status Register (CMCSR)
CMCSR is a 16-bit register that indicates the occurrence of compare matches, and sets the
enable/disable of DMA transfer requests and the clock used for incrementation.
Bit
Bit Name
Initial Value
R/W
Description
15 to 8
—
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
7
CMF
0
R/(W)
*
Compare Match Flag
Indicates whether CMCNT and CMCOR values
have matched or not.
0: CMCNT and CMCOR values have not matched
[Clearing condition]
Write 0 to CMF after reading CMF = 1
1: CMCNT and CMCOR values have matched
6, 5
—
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
4
CMR
0
R/W
Compare Match Request
0: Disables a DMA transfer request
1: Enables a DMA transfer request
3, 2
—
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
1
0
CKS1
CKS0
0
0
R/W
R/W
Clock Select
Select the clock input to CMCNT from among the
four internal clocks obtained by dividing the
peripheral clock (P
φ
). When the STR bit in
CMSTR is set to 1, CMCNT begins incrementing
with the clock selected by the CKS1 and CKS0
bits.
00: P
φ
/4
01: P
φ
/8
10: P
φ
/16
11: P
φ
/64
Note:
*
Only 0 can be written for clearing the flags.
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