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7 ClOCK GeneRaTOR (ClG)
HSCLK
OSC1
note: The interrupt controller (ITC) needs PCLK only when the register is set.
Clock supply control
PCLK supply is controlled by PCKEN[1:0]/CLG_PCLK register and PRUN/PSC_CTL register.
Stop the clock supply to reduce current consumption unless all peripheral modules (modules listed below)
within the internal peripheral circuit area need to be running.
note: Do not set PCKEN[1:0]/CLG_PCLK register to 0x2 or 0x1 and PRUN/PSC_CTL register to 0,
since doing so will stop the operation of certain peripheral modules.
Peripheral modules
16-bit timer (T16)
8-bit timer (T8F)
UART
SPI
I
C master (I2CM)
2
I
C slave (I2CS)
2
16-bit PWM timer (T16E)
I/O port (P)
MISC register (MISC)
Power generator (VD1)
Supply voltage detector (SVD)
IR remote controller (REMC)
A/D converter (ADC10)
Interrupt controller (ITC) *
Clock timer (CT)
Stopwatch timer (SWT)
Watchdog timer (WDT)
8-bit OSC1 timer (T8OSC1)
Real-time clock (RTC)
(S1C17624/604)
LCD driver (LCD)
R/F converter (RFC)
FOUTH/FOUT1 outputs
16-bit PWM timer (T16A2)
(S1C17624/604)
* The interrupt controller (ITC) needs PCLK only when the register is set.
7-8
On/Off control
System clock
Gate
Figure 7.
6.1 Peripheral Module Clock Control Circuit
Table 7.
6.1 PCLK Control
PCKen[1:0]
0x3
0x2
0x1
0x0
Table 7.
6.2 Peripheral Modules and Operating Clocks
Operating clock
PCLK
OSC1 clock/
divided OSC1 clock
OSC1 clock
Clock selected by software
(divided HSCLK clock/
OSC1 clock)
Clock selected by software
(divided IOSC/OSC3/OSC1
clock)
Seiko epson Corporation
Internal peripheral modules
• 16-bit timer (T16)
• 8-bit timer (T8F)
PCLK
• UART
• SPI
• I
2
C master (I2CM)
• I
2
C slave (I2CS)
• 16-bit PWM timer (T16E)
• I/O port (P)
• MISC register (MISC)
• Power generator (VD1)
• Supply voltage detector (SVD)
• IR remote controller (REMC)
• A/D converter (ADC10)
• Interrupt controller (ITC)
PRun
PClK supply
1
Enabled (on)
*
Setting prohibited
*
Setting prohibited
0
Disabled (off)
(Default: PCKEN[1:0] = 0x3, PRUN = 0)
The PCLK supply cannot be disabled if one or more
peripheral modules in these list must be operated.
The PCLK supply can be disabled if all the periph-
eral circuits in these list can be stopped.
The OSC1 oscillator circuit cannot be disabled if
one or more peripheral modules in these list must
be operated. The PCLK supply can be disabled.
The OSC1 oscillator and clock supply to the RTC
can be controlled using RTCCE/RTC_CC register.
The clock supply to the OSC1 peripheral circuits
listed above and PCLK supply can be disabled.
The oscillator circuit used as the clock source can-
not be disabled (see each peripheral module chap-
ter). The PCLK supply can be disabled.
The oscillator circuit used as the clock source cannot
be disabled (see the "16-bit PWM Timers (T16A2)"
chapter). The PCLK supply can be disabled.
S1C17624/604/622/602/621 TeChniCal Manual
Remarks
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