7 ClOCK GeneRaTOR (ClG)
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
7-13
D1
OSC1en: OSC1 enable Bit
Enables or disables OSC1 oscillator operations.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
When the system clock is switched to OSC1 immediately after the OSC1 oscillator circuit is turned on,
the OSC1 clock is supplied to the system after the OSC1 clock system supply wait time indicated below
(at a maximum) has elapsed.
OSC1 clock system supply wait time
≤
OSC1 oscillation start time (max.) + OSC1 oscilla-
tion
stabilization wait time (256 cycles)
note: The OSC1 oscillator cannot be stopped if the OSC1 clock is being used as the system clock.
D0
OSC3en: OSC3 enable Bit
Enables or disables OSC3 oscillator operations.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
note: The OSC3 oscillator cannot be stopped if the OSC3 clock is being used as the system clock.
noise Filter enable Register (OSC_nFen)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
noise Filter
enable Register
(OSC_nFen)
0x5062
(8 bits)
D7–2 –
reserved
–
–
–
0 when being read.
D1
RSTFe
Reset noise filter enable
1 Enable
0 Disable
1
R/W
D0
nMiFe
NMI noise filter enable
1 Enable
0 Disable
0
R/W
D[7:2]
Reserved
D1
RSTFe: Reset noise Filter enable Bit
Enables or disables the RESET input noise filter.
1 (R/W): Enabled (noise filtering) (default)
0 (R/W): Disabled (bypass)
This should normally be enabled.
D0
nMiFe: nMi noise Filter enable Bit
Enables or disables the NMI input noise filter.
1 (R/W): Enabled (noise filtering)
0 (R/W): Disabled (bypass) (default)
note: The S1C17624/604/622/602/621 has no external NMI input pin, but the watchdog timer NMI
request signal passes through the filter.
FOuT Control Register (OSC_FOuT)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
FOuT Control
Register
(OSC_FOuT)
0x5064
(8 bits)
D7–4 –
reserved
–
–
–
0 when being read.
D3–2 FOuThD
[1:0]
FOUTH clock division ratio select
FOUTHD[1:0]
Division ratio
0x0 R/W Source clock =
HSCLK
0x3
0x2
0x1
0x0
reserved
1/4
1/2
1/1
D1
FOuThe
FOUTH output enable
1 Enable
0 Disable
0
R/W
D0
FOuT1e
FOUT1 output enable
1 Enable
0 Disable
0
R/W
D[7:4]
Reserved
D[3:2]
FOuThD[1:0]: FOuTh Clock Division Ratio Select Bits
Selects the HSCLK clock division ratio to set the FOUTH clock frequency.