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CHAPTER 13 PLL FREQUENCY SYNTHESIZER
User’s Manual U15104EJ2V0UD
(2) PLL reference mode register (PLLRF)
This register selects the reference frequency f
r
of the PLL frequency synthesizer and sets the disabled status
of the PLL frequency synthesizer.
PLLRF is set with 1-bit or 8-bit memory manipulation instruction.
The value of this register is set to 0FH after reset and in the STOP mode.
In the HALT mode, it holds the value immediately before the HALT mode was set.
Figure 13-3. Format of PLL Reference Mode Register (PLLRF)
PLLRF3 PLLRF2 PLLRF1 PLLRF0
Setting of reference frequency f
r
of PLL frequency synthesizer
0
0
0
0
50 kHz
0
0
0
1
25 kHz
0
0
1
0
12.5 kHz
0
0
1
1
9 kHz
0
1
0
0
1 kHz
0
1
0
1
3 kHz
0
1
1
0
10 kHz
0
1
1
1
Setting prohibited
1
×
×
×
PLL disable
Note
Note
When PLL disable is selected, the status of the VCOL, VCOH, EO0, and EO1 pins are as follows:
VCOH, VCOL pins: Status specified by bit 3 (VCOHDMD) and bit 2 (VCOLDMD) of the PLL mode
select register (PLLMD).
EO0, EO1 pins:
High-impedance state
Remark
Bits 4 to 7 are fixed to 0 by hardware.
×
: Don’t care
7
0
6
0
5
0
4
0
PLLRF3 PLLRF2 PLLRF1 PLLRF0
Symbol
PLLRF
R/W
R/W
Address
FFA1H
After reset
0FH
<1>
<0>
<3>
<2>
Содержание mPD178053
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