CONTENTS
ii
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
6.1 CMU Module Overview ....................................................................................................6-1
6.2 CMU Pins .........................................................................................................................6-2
6.3 Oscillators ........................................................................................................................6-2
6.3.1 OSC3 Oscillator Circuit ......................................................................................6-2
6.3.2 OSC1 Oscillator Circuit ......................................................................................6-3
6.4.1 PLL On/Off Control ............................................................................................6-4
6.4.2 Selecting the PLL Input Clock ...........................................................................6-5
6.4.3 Setting the Frequency Multiplication Rate .........................................................6-5
6.4.4 Other PLL Settings ............................................................................................6-6
6.4.5 Power Supply for PLL ........................................................................................6-7
6.5.1 SSCG On/Off Control ........................................................................................6-7
6.5.2 SS Modulation Parameter Settings ....................................................................6-8
6.6.1 System Clock Source Selection .........................................................................6-9
6.6.2 System Clock Frequency Setting ......................................................................6-10
6.6.3 Main System Clock (MCLK) Setting ..................................................................6-10
6.7.1 Core Clock (CCLK) ...........................................................................................6-11
6.7.2 Bus Clock (BCLK) .............................................................................................6-11
6.7.3 Peripheral Module Clocks (PCLK1, PCLK2) .....................................................6-12
6.7.4 GE Module Clock (GCLK) .................................................................................6-12
6.7.5 LCDC Module Clock (LCLK) .............................................................................6-13
6.7.6 SRAMC and SDRAMC Clock (SDCLK) ............................................................6-13
6.7.7 USB Clocks (USBCLK, USBREGCLK) .............................................................6-14
6.8 Clock External Output (CMU_CLK) .................................................................................6-14
6.9 Standby Modes ...............................................................................................................6-15
Clock Source Select Register (CMU_OSCSEL) ....................................................................... 6-16
Oscillation Control Register (CMU_OSCCTL) .......................................................................... 6-17
LCDC Clock Division Ratio Select Register (CMU_LCLKDIV) ................................................. 6-18
Clock Control Register (CMU_CLKCTL) .................................................................................. 6-19
System Clock Division Ratio Select Register (CMU_SYSCLKDIV) ......................................... 6-21
CMU_CLK Select Register (CMU_CMUCLK) .......................................................................... 6-22
PLL Input Clock Division Ratio Select Register (CMU_PLLINDIV) .......................................... 6-23
PLL Control Register 0 (CMU_PLLCTL0) ................................................................................ 6-24
PLL Control Register 1 (CMU_PLLCTL1) ................................................................................ 6-25
PLL Control Register 2 (CMU_PLLCTL2) ................................................................................ 6-26
SSCG Macro Control Register 0 (CMU_SSCG0) ..................................................................... 6-26
SSCG Macro Control Register 1 (CMU_SSCG1) ..................................................................... 6-26
CMU Write Protect Register (CMU_PROTECT) ....................................................................... 6-27
8.1 RTC Module Overview .....................................................................................................8-1
8.2 RTC Counters ..................................................................................................................8-2