upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 82

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.1 Functions of Clock Generator
5.2 Configuration of Clock Generator
82
The clock generator generates the clock to be supplied to the CPU and peripheral hardware.
The following two system clock oscillators are available.
• High-speed system clock oscillator
• Internal oscillator
Remarks 1. f
The clock generator includes the following hardware.
Control registers
Oscillator
The following two high-speed system clock oscillators are available.
High-speed system clock oscillation can be selected using the option byte. Refer to CHAPTER 20 OPTION
BYTE for details.
The high-speed system clock oscillator can be stopped by executing the STOP instruction or setting the main
OSC control register (MOC).
The internal oscillator oscillates a clock of f
internal oscillation mode register (RCM) when “Can be stopped by software” is set by the option byte and the
high-speed system clock is used as the CPU clock.
•
•
Crystal/ceramic oscillator: Oscillates a clock of f
External RC oscillator:
2. f
Item
XP
R
: Internal oscillation clock frequency
: High-speed system clock oscillation frequency
Processor clock control register (PCC)
Internal oscillation mode register (RCM)
Main clock mode register (MCM)
Main OSC control register (MOC)
Oscillation stabilization time counter status register (OSTC)
Oscillation stabilization time select register (OSTS)
High-speed system clock oscillator
Internal oscillator
Table 5-1. Configuration of Clock Generator
CHAPTER 5 CLOCK GENERATOR
Oscillates a clock of f
User’s Manual U16846EJ3V0UD
R
= 240 kHz (TYP.). Oscillation can be stopped by setting the
XP
XP
= 2 to 16 MHz
= 3 to 4 MHz
Configuration