154
Chapter 4
Clock Generator
Preliminary User’s Manual U17566EE1V2UM00
(3)
SCC - SPCLK control register
The 8-bit SCC register selects the SPCLK sources.
Access
This register can be read/written in 8-bit or 1-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 F832
H
.
Initial Value
00
H
. The register is initialized by entering WATCH, Sub-WATCH, or STOP
mode
Note
1.
“Main osc” is the clock provided by the main oscillator.
2.
“PLL” is the clock provided by the PLL.
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
a
a)
This bit must not be altered.
SPSEL0
R
R
R
R
R
R
R/W
R/W
Table 4-15
SCC register contents
Bit position
Bit name
Function
0
SPSEL0
Source selection for generating the SPCLK clocks:
SPSEL0
Clock sources
SPCLK0
SPCLK1
SPCLK2
0
Main osc
Main osc
Main osc
1
PLL / 2
PLL / 4
Main osc
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