UPD78F9418A NEC, UPD78F9418A Datasheet - Page 89

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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5.1 Functions of Clock Generator
5.2 Configuration of Clock Generator
Control registers
Oscillators
The clock generator generates the clock to be supplied to the CPU and peripheral hardware.
The following two types of system clock oscillators are used.
• • • • Main system clock oscillator
• • • • Subsystem clock oscillator
The clock generator consists of the following hardware.
This circuit oscillates at 1.0 to 5.0 MHz. Oscillation can be stopped by executing the STOP instruction or
setting the processor clock control register (PCC).
This circuit oscillates at 32.768 kHz. Oscillation can be stopped by the suboscillation mode register (SCKM).
Item
Processor clock control register (PCC)
Suboscillation mode register (SCKM)
Subclock control register (CSS)
Main system clock oscillator
Subsystem clock oscillator
Table 5-1. Configuration of Clock Generator
CHAPTER 5 CLOCK GENERATOR
User’s Manual U13952EJ3V0UD
Configuration
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