2 POWER SUPPLY, RESET, AND CLOCKS
S1C17F13 TeChniCal Manual
Seiko epson Corporation
2-15
(Rev. 1.0)
Each bit corresponds to the clock source as follows:
CLGOSC.EXOSCSLPC bit: EXOSC clock input
CLGOSC.OSC3ASLPC bit: OSC3A oscillator circuit
CLGOSC.OSC1SLPC bit: OSC1 oscillator circuit
CLGOSC.OSC3BSLPC bit: OSC3B oscillator circuit
Bits 7–4
Reserved
Bit 3
eXOSCen
Bit 2
OSC3aen
Bit 1
OSC1en
Bit 0
OSC3Ben
These bits control the clock source operation.
1(R/W): Start oscillating or clock input
0(R/W): Stop oscillating or clock input
Each bit corresponds to the clock source as follows:
CLGOSC.EXOSCEN bit: EXOSC clock input
CLGOSC.OSC3AEN bit: OSC3A oscillator circuit
CLGOSC.OSC1EN bit: OSC1 oscillator circuit
CLGOSC.OSC3BEN bit: OSC3B oscillator circuit
ClG OSC3B Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
CLGOSC3B
15–8 –
0x00
–
R
–
7–2 –
0x00
–
R
1–0 OSC3BFREQ[1:0]
0x0
H0
R/WP
Bits 15–2 Reserved
Bits 1–0
OSC3BFReQ[1:0]
These bits select the OSC3BCLK frequency.
6.4 OSC3BCLK Frequency Selection
Table 2.
CLGOSC3B.OSC3BFREQ[1:0] bits
OSC3BCLK frequency MHz
0x3
20
0x2
16
0x1
12
0x0
8
ClG OSC1 Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
CLGOSC1
15–8 –
0x1a
–
R
–
7–4 –
0xc
–
R
3
–
0
–
R
2
OSC1SEL
1
H0
R/WP
1–0 OSC1WT[1:0]
0x2
H0
R/WP
Bits 15–3 Reserved
Bit 2
OSC1Sel
This bit selects the OSC1 clock source.
1 (R/WP): OSC1B oscillator circuit
0 (R/WP): OSC1A oscillator circuit
Bits 1–0
OSC1WT[1:0]
These bits set the oscillation stabilization waiting time for the OSC1 oscillator circuit.