upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 64

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

5.1
peripheral hardware, and a circuit that generates a clock (interval time generation clock) to be supplied to the
watchdog timer and 8-bit timer H1 (TMH1).
5.1.1
5.1.2
64
The clock generators include a circuit that generates a clock (system clock) to be supplied to the CPU and
The following three types of system clock oscillators are used.
• High-speed internal oscillator
• Crystal/ceramic oscillator
• External clock input circuit
The system clock source is selected by using the option byte. For details, refer to CHAPTER 15 OPTION BYTE.
When using the X1 and X2 pins as I/O port pins, refer to CHAPTER 4 PORT FUNCTIONS for details.
The following circuit is used as a clock oscillator for interval time generation.
• Low-speed internal oscillator
This circuit internally oscillates a clock of 8 MHz (TYP.). Its oscillation can be stopped by execution of the STOP
instruction.
If the High-speed internal oscillator is selected to supply the system clock, the X1 and X2 pins can be used as
I/O port pins.
This circuit oscillates a clock with a crystal/ceramic oscillator connected across the X1 and X2 pins. It can
oscillate a clock of 1 MHz to 10 MHz. Oscillation of this circuit can be stopped by execution of the STOP
instruction.
This circuit supplies a clock from an external IC to the X1 pin. A clock of 1 MHz to 10 MHz can be supplied.
Internal clock supply can be stopped by execution of the STOP instruction.
If the external clock input is selected as the system clock, the X2 pin can be used as an I/O port pin.
This circuit oscillates a clock of 240 kHz (TYP.). Its oscillation can be stopped by using the low-speed internal
oscillation mode register (LSRCM) when it is specified by the option byte that its oscillation can be stopped by
software.
Functions of Clock Generators
System clock oscillators
Clock oscillator for interval time generation
CHAPTER 5 CLOCK GENERATORS
User’s Manual U16994EJ3V0UD