9-4
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
9.4.
Control Registers
WDT2 Clock Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
WDT2CLK
15
–
9
–
0x00
–
R
–
8
DBRUN
0
H0
R/WP
7
–
6
–
0x0
–
R
5
–
4
CLKDIV[1:0]
0x0
H0
R/WP
3
–
2
–
0x0
–
R
1
–
0
CLKSRC[1:0]
0x0
H0
R/WP
Bits 15
–
9
Reserved
Bit 8
DBRUN
This bit sets whether the WDT2 operating clock is supplied in DEBUG mode or not.
1 (R/WP): Clock supplied in DEBUG mode
0 (R/WP): No clock supplied in DEBUG mode
Bits 7
–
6
Reserved
Bits 5
–
4
CLKDIV[1:0]
These bits select the division ratio of the WDT2 operating clock (counter clock). The clock
frequency should be set to around 256 Hz.
Bits 3
–
2
Reserved
Bits 1
–
0
CLKSRC[1:0]
These bits select the clock source of WDT2.
Table 9.4.1 Clock Source and Division Ratio Settings
WDT2CLK.
CLKDIV[1:0] bits
WDT2CLK.CLKSRC[1:0] bits
0x0
0x1
0x2
0x3
IOSC
OSC1
OSC3
EXOSC
0x3
1/65,536
1/128
1/65,536
1/1
0x2
1/32,768
1/32,768
0x1
1/16,384
1/16,384
0x0
1/8,192
1/8,192
(Note) The oscillation circuits/external input that are not supported in this IC cannot be
selected as the clock source.
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