2-22
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
CLG System Clock Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
CLGSCLK
15
WUPMD
0
H0
R/WP
–
14
–
0
–
R
13
–
12
WUPDIV[1:0]
0x0
H0
R/WP
11
–
10
–
0x0
–
R
9
–
8
WUPSRC[1:0]
0x0
H0
R/WP
7
–
6
–
0x0
–
R
5
–
4
CLKDIV[1:0]
0x2
H0
R/WP
3
–
2
–
0x0
–
R
1
–
0
CLKSRC[1:0]
0x0
H0
R/WP
Bit 15
WUPMD
This bit enables the SYSCLK switching function at wake-up.
1 (R/WP):
Enable
0(R/WP):
Disable
When the CLGSCLK.WUPMD bit = 1, setting values of the CLGSCLK.WUPSRC[1:0] bits and
the CLGSCLK.WUPDIV[1:0] bits are loaded to the CLGSCLK.CLKSRC[1:0] bits and the
CLGSCLK. CLKDIV[1:0] bits, respectively, at wake-up from SLEEP mode to switch SYSCLK.
When the CLG- SCLK.WUPMD bit = 0, the CLGSCLK.CLKSRC[1:0] and
CLGSCLK.CLKDIV[1:0] bits are not altered at wake-up.
Bit 14
Reserved
Bits 13
–
12 WUPDIV[1:0]
These bits select the SYSCLK division ratio for resetting the CLGSCLK.CLKDIV[1:0] bits at
wake-up. This setting is ineffective when the CLGSCLK.WUPMD bit = 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.
Table 2.6.2 SYSCLK Clock Source and Division Ratio Settings at Wake-up
CLGSCLK.
WUPDIV[1:0] bits
CLGSCLK.WUPSRC[1:0] bits
0x0
0x1
0x2
0x3
IOSCCLK
OSC1CLK
OSC3CLK
EXOSCCLK
0x3
1/8
Reserved
1/16
Reserved
0x2
1/4
Reserved
1/8
Reserved
0x1
1/2
1/2
1/2
Reserved
0x0
1/1
1/1
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.
Table 2.6.3 SYSCLK Clock Source and Division Ratio Settings
CLGSCLK.
CLKDIV[1:0] bits
CLGSCLK.CLKSRC[1:0] bits
0x0
0x1
0x2
0x3
IOSCCLK
OSC1CLK
OSC3CLK
EXOSCCLK
0x3
1/8
Reserved
1/16
Reserved
0x2
1/4
Reserved
1/8
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
Summary of Contents for S1C31D50
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