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7 ClOCK GeneRaTOR (ClG)
7-10
Seiko epson Corporation
S1C17153 TeChniCal Manual
(Rev. 1.0)
note
: The OSC1A oscillator cannot be stopped if the OSC1A clock is being used as the system
clock.
D0
Reserved
FOuTa Control Register (ClG_FOuTa)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
FOuTa Control
Register
(ClG_FOuTa)
0x5064
(8 bits)
D7
–
reserved
–
–
–
0 when being read.
D6–4
FOuTaD
[2:0]
FOUTA clock division ratio select
FOUTAD[2:0]
Division ratio
0x0 R/W
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
1/128
1/64
1/32
1/16
1/8
1/4
1/2
1/1
D3–2
FOuTaSRC
[1:0]
FOUTA clock source select
FOUTASRC[1:0] Clock source
0x0 R/W
0x3, 0x2
0x1
0x0
reserved
OSC1A
OSC3B
D1
–
reserved
–
–
–
0 when being read.
D0
FOuTae
FOUTA output enable
1 Enable
0 Disable
0
R/W
D7
Reserved
D[6:4]
FOuTaD[2:0]: FOuTa Clock Division Ratio Select Bits
Selects the source clock division ratio to set the FOUTA clock frequency.
8.4 Clock Division Ratio Selection
Table 7.
FOuTaD[2:0]
Division ratio
0x7
1/128
0x6
1/64
0x5
1/32
0x4
1/16
0x3
1/8
0x2
1/4
0x1
1/2
0x0
1/1
(Default: 0x0)
D[3:2]
FOuTaSRC[1:0]: FOuTa Clock Source Select Bits
Selects the FOUTA clock source.
8.5 FOUTA Clock Source Selection
Table 7.
FOuTaSRC[1:0]
Clock source
0x3, 0x2
Reserved
0x1
OSC1A
0x0
OSC3B
(Default: 0x0)
D1
Reserved
D0
FOuTae: FOuTa Output enable Bit
Enables or disables FOUTA clock external output.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
Setting FOUTAE to 1 outputs the FOUTA clock from the FOUTA pin. Setting it to 0 stops the output.