2 POWER SUPPLY, RESET, AND CLOCKS
2-14
Seiko epson Corporation
S1C17F13 TeChniCal Manual
(Rev. 1.0)
Bits 11–10 Reserved
Bits 9–8
WuPSRC[1:0]
These bits select the SYSCLK clock source for resetting the CLGSCLK.CLKSRC[1:0] bits at wake-up.
When a currently stopped clock source is selected, it will automatically start oscillating or clock input
at wake-up. However, this setting is ineffective when the CLGSCLK.WUPMD bit = 0.
6.2 SYSCLK Clock Source and Division Ratio Settings at Wake-up
Table 2.
CLGSCLK.
WUPDIV[1:0] bits
CLGSCLK.WUPSRC[1:0] bits
0x0
0x1
0x2
0x3
OSC3BCLK
–
OSC3ACLK
EXOSCCLK
0x3
Reserved
Reserved
1/8
Reserved
0x2
Reserved
Reserved
1/4
Reserved
0x1
1/2
Reserved
1/2
Reserved
0x0
1/1
Reserved
1/1
1/1
Bits 7–6
Reserved
Bits 5–4
ClKDiV[1:0]
These bits set the division ratio of the clock source to determine the SYSCLK frequency.
Bits 3–2
Reserved
Bits 1–0
ClKSRC[1:0]
These bits select the SYSCLK clock source.
When a currently stopped clock source is selected, it will automatically start oscillating or clock input.
6.3 SYSCLK Clock Source and Division Ratio Settings
Table 2.
CLGSCLK.
CLKDIV[1:0] bits
CLGSCLK.CLKSRC[1:0] bits
0x0
0x1
0x2
0x3
OSC3BCLK
OSC1CLK
OSC3ACLK
EXOSCCLK
0x3
Reserved
Reserved
1/8
Reserved
0x2
Reserved
Reserved
1/4
Reserved
0x1
1/2
1/2
1/2
Reserved
0x0
1/1
1/1
1/1
1/1
ClG Oscillation Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
CLGOSC
15–12 –
0x0
–
R
–
11 EXOSCSLPC
1
H0
R/W
10 OSC3ASLPC
1
H0
R/W
9
OSC1SLPC
1
H0
R/W
8
OSC3BSLPC
1
H0
R/W
7–4 –
0x0
–
R
3
EXOSCEN
0
H0
R/W
2
OSC3AEN
0
H0
R/W
1
OSC1EN
0
H0
R/W
0
OSC3BEN
1
H0
R/W
Bits 15–12 Reserved
Bit 11
eXOSCSlPC
Bit 10
OSC3aSlPC
Bit 9
OSC1SlPC
Bit 8
OSC3BSlPC
These bits control the clock source operations in SLEEP mode.
1 (R/W): Stop clock source in SLEEP mode
0 (R/W): Continue operation state before SLEEP