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Rev. 1.00, 05/04, page 192 of 544
10.3.4 Timer Control Register (TCR)
TCR selects the TCNT clock source and the condition by which TCNT is cleared, and
enables/disables interrupt requests.
TCR_Y can be accessed when the HIE bit in SYSCR is 0 and the TMRX/Y bit in TCONRS is 1.
TCR_X can be accessed when the HIE bit in SYSCR is 0 and the TMRX/Y bit in TCONRS is 0.
Bit Bit Name
Initial
Value R/W Description
7 CMIEB 0 R/W Compare-Match Interrupt Enable B
Selects whether the CMFB interrupt request (CMIB) is
enabled or disabled when the CMFB flag in TCSR is set
to 1. For TMR_X, a CMIB interrupt does not occur
irrespective of the value of this bit.
0: CMFB interrupt request (CMIB) is disabled
1: CMFB interrupt request (CMIB) is enabled
6 CMIEA 0 R/W Compare-Match Interrupt Enable A
Selects whether the CMFA interrupt request (CMIA) is
enabled or disabled when the CMFA flag in TCSR is set
to 1. For TMR_X, a CMIA interrupt does not occur
irrespective of the value of this bit.
0: CMFA interrupt request (CMIA) is disabled
1: CMFA interrupt request (CMIA) is enabled
5 OVIE 0 R/W Timer Overflow Interrupt Enable
Selects whether the OVF interrupt request (OVI) is
enabled or disabled when the OVF flag in TCSR is set
to 1. For TMR_X, an OVI interrupt does not occur
irrespective of the value of this bit.
0: OVF interrupt request (OVI) is disabled
1: OVF interrupt request (OVI) is enabled
4
3
CCLR1
CCLR0
0
0
R/W
R/W
Counter Clear 1, 0
These bits select the method by which the timer counter
is cleared.
00: Clearing is disabled
01: Cleared on compare-match A
10: Cleared on compare-match B
11: Cleared on rising edge of external reset input
2
1
0
CKS2
CKS1
CKS0
0
0
0
R/W
R/W
R/W
Clock Select 2 to 0
These bits select the clock input to TCNT and count
condition, together with the ICKS1 and ICKS0 bits in
STCR. For details, see table 10.3.