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Rev. 1.00, 05/04, page 195 of 544
Table 10.3 Clock Input to TCNT and Count Condition (3)
TCR TCRAB
Channel CKS2 CKS1 CKS0 CKSA CKSB Description
TMR_B 0 0 0 — 0 Disables clock input
0 0 1 — 0 Increments at φ/4
0 1 0 — 0 Increments at φ/256
0 1 1 — 0 Increments at φ/2048
1 0 0 — 0 Disables clock input
0 0 0 — 1 Disables clock input
0 0 1 — 1 Increments at φ/4096
0 1 0 — 1 Increments at φ/8192
0 1 1 — 1 Increments at φ/16384
1 0 0 — 1 Increments at overflow signal from
TCNT_A*
1 0 1 — — Increments at rising edge of external
clock
1 1 0 — — Increments at falling edge of external
clock
1 1 1 — — Increments at both rising and falling
edges of external clock
TMR_A 0 0 0 0 — Disables clock input
0 0 1 0 — Increments at φ
0 1 0 0 — Increments at φ/2
0 1 1 0 — Increments at φ/4
1 0 0 0 — Disables clock input
0 0 0 1 — Disables clock input
0 0 1 1 — Increments at φ/2048
0 1 0 1 — Increments at φ/4096
0 1 1 1 — Increments at φ/8192
1 0 0 1 — Increments at compare-match A from
TCNT_B*
1 0 1 — — Increments at rising edge of external
clock
1 1 0 — — Increments at falling edge of external
clock
1 1 1 — — Increments at both rising and falling
edges of external clock
Notes: * If the TMR_B clock input is set as the TCNT_A overflow signal and the TMR_A clock
input is set as the TCNT_B compare-match signal simultaneously, a count-up clock
cannot be generated. These settings should not be made.