21 HW Processor (HWP) and Sound Output
S1C31D50/D51 TECHNICAL MANUAL
Seiko Epson Corporation
21-27
(Rev. 2.00)
Bit 0
HWP0TRG
This bit starts executing the command specified by the HWP internal register.
1 (W):
Trigger to issue command
0 (W):
Setting prohibited
1 (R):
In command issuing process
0 (R):
Command issuance completed/standby to issue command
SDAC Clock Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
SDACCLK
15–9 –
0x00
–
R
–
8
DBRUN
0
H0
R/W
7–6 –
0x0
–
R
5–4 CLKDIV[1:0]
0x0
H0
R/W
3–2 –
0x0
–
R
1–0 CLKSRC[1:0]
0x0
H0
R/W
Bits 15–9 Reserved
Bit 8
DBRUN
This bit sets whether the SDAC operating clock is supplied in DEBUG mode or not.
1 (R/W): Clock supplied in DEBUG mode
0 (R/W): No clock supplied in DEBUG mode
Bits 7–6
Reserved
Bits 5–4
CLKDIV[1:0]
These bits select the division ratio of the SDAC operating clock.
Bits 3–2
Reserved
Bits 1–0
CLKSRC[1:0]
These bits select the clock source of SDAC.
Table 21.7.1 Clock Source and Division Ratio Settings
SDACCLK.
CLKDIV[1:0] bits
SDACCLK.CLKSRC[1:0] bits
0x0
0x1
0x2
0x3
IOSC
OSC1
OSC3
EXOSC
0x3
Reserved
Reserved
Reserved
Reserved
0x2
0x1
0x0
1/1
1/1
1/1
(Note) The oscillation circuits/external input that are not supported in this IC cannot be
selected as the clock source.
Note: The SDACCLK register settings can be altered only when the SDACCTL.SDACEN bit = 0.
SDAC Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
SDACCTL
15–8 –
0x00
–
R
–
7–1 –
0x00
–
R
0
SDACEN
0
H0
R/W
Bits 15–1 Reserved
Bit 0
SDACEN
This bit enables the SDAC operations.
1 (R/W): Enable SDAC operations (The operating clock is supplied.)
0 (R/W): Disable SDAC operations (The operating clock is stopped.)