Section 13 8-Bit Timer (TMR)
Table 13.2 Clock Input to TCNT and Count Condition
TCR
Channel
CKS2
CKS1
TMR_0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
TMR_1
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
TMR_Y
0
0
0
0
0
1
0
1
1
0
TMR_X
0
0
0
0
0
1
0
1
1
0
Common
1
0
1
1
1
1
Legend: : Don't care
Note: * If the TMR_0 clock input is set as the TCNT_1 overflow signal and the TMR_1 clock input is set as
the TCNT_0 compare-match signal simultaneously, a count-up clock cannot be generated.
Simultaneous setting of this condition should therefore be avoided.
Rev. 3.00 Jan 25, 2006 page 322 of 872
REJ09B0286-0300
STCR
CKS0
ICKS1
ICKS0
0
—
—
1
—
0
1
—
1
0
—
0
0
—
1
1
—
0
1
—
1
0
—
—
0
—
—
1
0
—
1
1
—
0
0
—
0
1
—
1
0
—
1
1
—
0
—
—
0
—
—
1
—
—
0
—
—
1
—
—
0
—
—
0
—
—
1
—
—
0
—
—
1
—
—
0
—
—
1
—
—
0
—
—
1
—
—
Description
Disables clock input
Increments at falling edge of internal clock φ/8
Increments at falling edge of internal clock φ/2
Increments at falling edge of internal clock φ/64
Increments at falling edge of internal clock φ/32
Increments at falling edge of internal clock φ/1024
Increments at falling edge of internal clock φ/256
Increments at overflow signal from TCNT_1 *
Disables clock input
Increments at falling edge of internal clock φ/8
Increments at falling edge of internal clock φ/2
Increments at falling edge of internal clock φ/64
Increments at falling edge of internal clock φ/128
Increments at falling edge of internal clock φ/1024
Increments at falling edge of internal clock φ/2048
Increments at compare-match A from TCNT_0 *
Disables clock input
Increments at falling edge of internal clock φ/4
Increments at falling edge of internal clock φ/256
Increments at falling edge of internal clock φ/2048
Setting prohibited
Disables clock input
Increments at falling edge of internal clock φ
Increments at falling edge of internal clock φ/2
Increments at falling edge of internal clock φ/4
Setting prohibited
Increments at rising edge of external clock
Increments at falling edge of external clock
Increments at both rising and falling edges of
external clock.