UPD78F0411GA-GAM-AX Datasheet, PDF (115/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 5 CLOCK GENERATOR
(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^{Note 1}.
Figure 5-4. Format of Internal Oscillation Mode Register (RCM)
Address: FFA0H After reset: 80H^{Note 1} R/W^{Note 2}
Symbol
<7>
6
5
4
3
2
<1>
<0>
RCM
RSTS
0
0
0
0
0
LSRSTOP RSTOP
RSTS
0
1
Status of internal high-speed oscillator
Waiting for accuracy stabilization of internal high-speed oscillator
Stability operating of internal high-speed oscillator
LSRSTOP
Internal low-speed oscillator oscillating/stopped
0
Internal low-speed oscillator oscillating
1
Internal low-speed oscillator stopped
RSTOP
0
1
Internal high-speed oscillator oscillating/stopped
Internal high-speed oscillator oscillating
Internal high-speed oscillator stopped
Notes 1. The value of this register is 00H immediately after a reset release but automatically
changes to 80H after internal high-speed oscillator has been stabilized.
2. Bit 7 is read-only.
Caution When setting RSTOP to 1, be sure to confirm that the CPU operates with a clock
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.
User’s Manual U18698EJ1V0UD
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