CHAPTER 5 CLOCK GENERATOR
User’s Manual U16899EJ2V0UD
115
(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
Ring-OSC clock. Therefore, this register is valid only when the CPU is operating with the Ring-OSC clock.
MOC can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Figure 5-5. Format of Main OSC Control Register (MOC)
Address: FFA2H After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1 0
MOC
MSTOP
0 0 0 0 0 0 0
MSTOP
Control of high-speed system clock oscillator operation
0
High-speed system clock oscillator operating
1
High-speed system clock oscillator stopped
Cautions 1. Make sure that bit 1 (MCS) of the main clock mode register (MCM) is 0 before
setting MSTOP.
2. To stop high-speed system clock oscillation when the CPU is operating on the
subsystem clock, set bit 7 (MCC) of the processor clock control register (PCC) to
1 (setting by MSTOP is not possible).
Содержание MuPD78F0132H
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