Datasheet

78K0/Kx2-L CHAPTER 5 CLOCK GENERATOR
R01UH0028EJ0400 Rev.4.00 207
Sep 27, 2010
(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 5-7. 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 Status of internal high-speed oscillator
0 Waiting for accuracy stabilization of internal high-speed oscillator
1 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 Internal high-speed oscillator oscillating/stopped
0 Internal high-speed oscillator oscillating
1 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.
<1> 78K0/KY2-L, 78K0/KA2-L, and 78K0/KB2-L
• When MCS = 1 (when CPU operates with the high-speed system clock)
<2> 78K0/KC2-L
• 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.