NEC 78K0 Series User Manual page 141

(4) Internal oscillation mode register (RCM)
This register sets the operation mode of internal oscillator.
RCM can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 80H
Figure 6-4. Format of Internal Oscillation Mode Register (RCM)
Address: FFA0H After reset: 80H
Symbol <7>
RCM RSTS
RSTS
0
1
LSRSTOP
0
1
RSTOP
0
1
Notes 1. The value of this register is 00H immediately after a reset release but automatically
2. Bit 7 is read-only.
Caution When setting RSTOP to 1, be sure to confirm that the CPU operates with a clock
CHAPTER 6 CLOCK GENERATOR
Note 1
Note 1 Note 2
R/W
6 5
0 0
Waiting for accuracy stabilization of internal high-speed oscillator
Stability operating of internal high-speed oscillator
Internal low-speed oscillator oscillating/stopped
Internal low-speed oscillator oscillating
Internal low-speed oscillator stopped
Internal high-speed oscillator oscillating/stopped
Internal high-speed oscillator oscillating
Internal high-speed oscillator stopped
changes to 80H after internal high-speed oscillator has been stabilized.
other than the internal high-speed oscillation clock. Specifically, set under either of
the following conditions.
• When MCS = 1 (when CPU operates with the high-speed system clock)
• When CLS = 1 (when CPU operates with the subsystem clock)
In addition, stop peripheral hardware that is operating on the internal high-speed
oscillation clock before setting RSTOP to 1.
Preliminary User's Manual U17260EJ3V1UD
.
4 3
0 0
Status of internal high-speed oscillator
2 <1> <0>
0 LSRSTOP RSTOP
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