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Chapter 4
Clock Generator
Preliminary User’s Manual U17566EE1V2UM00
(2)
TCC - Watch Timer clock control register
The 8-bit TCC register determines the Watch Timer and LCD controller clock
source and the setting of the associated clock dividers. This register can be
changed only once after Power-On-Clear reset or external RESET.
Access
This register can be read/written in 8-bit units.
Writing to this register is protected by a special sequence of instructions.
Please refer to
“PHCMD - Command protection register” on page 140
for
details.
Address
FFFF F836
H
.
Initial Value
00
H
. The register is initialized at power-on and by external RESET.
7
6
5
4
3
2
1
0
0
WTPS2
WTPS1
WTPS0
0
WTSOS
WTSEL1
WTSEL0
R
a
a)
These bits may be written, but write is ignored.
R/W
R/W
R/W
R
a
R/W
R/W
R/W
Table 4-14
TCC register contents (1/2)
Bit position
Bit name
Function
6 to 4
WTPS[2:0]
LCDCLK clock divider selection:
WTPS2
WTPS1
WTPS0
Clock divider setting
0
0
0
1
0
0
1
1 / 2
0
1
0
1 / 4
0
1
1
1 / 8
1
0
0
1 / 16
1
0
1
1 / 32
1
1
0
1 / 64
1
1
1
1 / 128
1
WTSEL1
WTCLK (Watch Timer clock) divider setting:
0: WTCLK = LCDCLK.
1: WTCLK = LCDCLK / 2.
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