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CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U14581EJ3V0UM00
(2) Oscillator mode register (OSCM)
The
µ
PD780851(A) and
µ
PD780852(A) can be set to the reduced current consumption mode by setting OSCM
(only when operated at f
X
= 4 to 4.19 MHz).
OSCM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears OSCM to 00H.
Figure 5-3. Oscillator Mode Register (OSCM) Format
Address: FFA0H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
OSCM
HALFOSC
0
0
0
0
0
0
0
HALFOSC
Oscillator Mode Selection
0
Normal operation mode
1
Reduced current consumption mode (only when operated at f
X
= 4 to 4.19 MHz)
Cautions 1. This function is available only when the device is operated at f
X
= 4 to 4.19 MHz. In other
cases, be sure not to set 1 to HALFOSC.
2. When using in normal operation mode, setting OSCM is not necessary.
3. Only the first setting of OSCM is effective.
Remark
f
X
: Main system clock oscillation frequency
Summary of Contents for mPD780851
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