
GMS81508/16
17
2.3.2. Prescaler
The prescaler
consists of 11-bit binary counter, and input clock is supplied by oscillation circuit. The
frequency divided by prescaler is used as a source clock for peripherals.
Frequency-Divided Outputs of Prescaler
f
ex
(
)
PS1
PS2
PS3
PS4
PS5
PS6
PS7
PS8
PS9
PS10
PS11
Interval
4
2
1
500
250
125
62.5
31.25
15.36
7.18
3.59
Period
250
500
1
2
4
8
16
32
64
128
256
The peripheral clock supplied from prescaler can be stopped by ENPCK. (However, PS11 cannot
be stopped by ENPCK)
W
W
W
W
W
W
7
6
5
4
3
2
1
0
8
Internal Data Bus
Peripherals
ENPCK
f
ex
B.I.T.
PS1
PS2
PS3
PS4
PS5
PS6
PS7
PS8
PS9
PS10
PS11
PS1
PS2
PS3
PS4
PS5
PS6
PS7
PS8
PS9
PS10
PS11
8
PS0
Enable Peripheral Clock
0 : stop
1 : supply
ENPCK
WDTON
BTCL
BTS2
BTS1
BTS0
CKCTLR
<00D3
H
>