upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 112

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.3 Registers Controlling Clock Generator
(1) Processor clock control register (PCC)
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The following six registers are used to control the clock generator.
The PCC register is used to select the CPU clock, the division ratio, main system clock oscillator operation/stop
and whether to use the on-chip feedback resistor
The PCC is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears PCC to 00H.
Note The feedback resistor is required to control the bias point of the oscillation waveform so that the bias point
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)
is in the middle of the power supply voltage (see Figure 5-11 Subsystem Clock Feedback Resistor).
CHAPTER 5 CLOCK GENERATOR
User’s Manual U16899EJ3V0UD
Note
of the subsystem clock oscillator.