CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
109
(4) Main OSC control register (MOC)
This register selects the operation mode of the X1 input clock.
This register is used to stop the X1 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 5-6. 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 X1 oscillator operation
0
X1 oscillator operating
1
X1 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 X1 oscillation during operation with the subsystem clock, set bit 7 (MCC)
of the processor clock control register (PCC) to 1 (setting by MSTOP is not
possible).
Содержание 78K0/KD1 Series
Страница 2: ...Preliminary User s Manual U16315EJ1V0UD 2 MEMO ...
Страница 444: ...Preliminary User s Manual U16315EJ1V0UD 444 MEMO ...