Rev. 1.0, 09/02, page 285 of 568
Bit
Bit Name
Initial Value
R/W
Description
5 TME
0
R/W Timer
Enable
When this bit is set to 1, TCNT starts counting.
When this bit is cleared, TCNT stops counting and
is initialized to H
′
00.
4,
3
All
1
Reserved
These bits are always read as 1 and cannot be
modified.
2
1
0
CKS2
CKS1
CKS0
0
0
0
R/W
R/W
R/W
Clock Select 0 to 2
Selects the clock source to be input to TCNT. The
overflow frequency for
φ
= 20 MHz is enclosed in
parentheses.
000: Clock
φ
/2 (frequency: 25.6
µ
s)
001: Clock
φ
/64 (frequency: 819.2
µ
s)
010: Clock
φ
/128 (frequency: 1.6 ms)
011: Clock
φ
/512 (frequency: 6.6 ms)
100: Clock
φ
/2048 (frequency: 26.2 ms)
101: Clock
φ
/8192 (frequency: 104.9 ms)
110: Clock
φ
/32768 (frequency: 419.4 ms)
111: Clock
φ
/131072 (frequency: 1.68 s)
Note:
*
Only 0 can be written, for flag clearing.
Содержание H8S/2627
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