6 CLOCK MANAGEMENT UNIT (CMU)
6-12
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Peripheral Module Clocks (PCLK1, PCLK2)
6.7.3
PCLK1
PCLK1_EN
MCLK
PCLK2
PCLK2_EN
7.3.1 PCLK Control Circuit
Figure 6.
The PCLK1 and PCLK2 clocks are used to operate the modules listed below.
7.3.1 Peripheral Modules and Operating Clocks
Table 6.
Clock
Clock enable bit
Peripheral modules
PCLK1
PCLK1_EN/CMU_CLKCTL register
• Prescaler (PSC Ch.0)
• 8-bit programmable timer Ch.0, 2, 4, 6 (T8 Ch.0, 2, 4, 6)
• 16-bit PWM timer Ch.0, 1 (T16A5 Ch.0, 1)
• 16-bit audio PWM timer (T16P)
• Universal serial interface (USI)
• Serial interface Ch.0 (FSIO Ch.0)
• A/D converter (ADC10)
• I
2
S (I2S)
• Misc registers (MISC)
PCLK2
PCLK2_EN/CMU_CLKCTL register
• Prescaler (PSC Ch.1)
• 8-bit programmable timer Ch.1, 3, 5, 7 (T8 Ch.1, 3, 5, 7)
• Universal serial interface with LCD interface (USIL)
• Serial interface Ch.1 (FSIO Ch.1)
• Watchdog timer (WDT)
• Remote controller (REMC)
• Interrupt controller (ITC)
• I/O ports (GPIO)
• BBRAM
• Cache controller (CCU) registers
• Real-time clock (RTC) registers
• SRAM controller (SRAMC) registers
• SDRAM controller (SDRAMC) registers
• LCD controller (LCDC) registers
The peripheral module clock (PCLK1, PCLK2) supply can be controlled using the clock enable bit (PCLK1_EN,
PCLK2_EN).
The default setting of the clock enable bit is 1, which enables the clock supply. Disable the clock supply by setting
the clock enable bit to 0 to reduce current consumption unless all the modules that use the clock need to be running.
The clock is supplied even in HALT mode when the clock enable bit is set to 1. To stop the modules in HALT
mode, set the clock enable bit to 0 before executing the halt instruction.
In SLEEP mode (when the slp instruction is executed), these clocks stop even if the clock enable bit is set to 1.
GE Module Clock (GCLK)
6.7.4
GCLK
GCLK_EN
MCLK
7.4.1 GCLK Control Circuit
Figure 6.
The GCLK clock is the GE module operating clock. GCLK_EN/CMU_CLKCTL register is used for clock supply
control. The default setting of GCLK_EN is 1, which enables the clock supply. Disable the clock supply by setting
GCLK_EN to 0 to reduce current consumption when the GE functions are not used.
GCLK is supplied even in HALT mode when GCLK_EN is set to 1. To stop the GE module in HALT mode, set
GCLK_EN to 0 before executing the halt instruction.
In SLEEP mode (when the slp instruction is executed), GCLK stops even if GCLK_EN is set to 1.