upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 101

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Main OSC control register (MOC)
This register selects the operation mode of the high-speed system clock.
This register is used to stop the high-speed system clock oscillator operation when the CPU is operating with the
internal oscillation clock. Therefore, this register is valid only when the CPU is operating with the internal
oscillation clock.
MOC can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Address: FFA2H
Symbol
MOC
Cautions 1. Make sure that bit 1 (MCS) of the main clock mode register (MCM) is 0 before
MSTOP
MSTOP
<7>
0
1
After reset: 00H
2. To stop high-speed system clock oscillation when the CPU is operating on the
Figure 5-5. Format of Main OSC Control Register (MOC)
High-speed system clock oscillator operating
High-speed system clock oscillator stopped
setting MSTOP.
subsystem clock, set bit 7 (MCC) of the processor clock control register (PCC) to
1 (setting by MSTOP is not possible).
6
0
R/W
CHAPTER 5 CLOCK GENERATOR
User’s Manual U16962EJ3V0UD
5
0
Control of high-speed system clock oscillator operation
4
0
3
0
2
0
1
0
0
0
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