upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 113

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

f
MCC = 1
XP
Notes 1.
: Oscillation stopped
CPU clock: f
f
R
: Oscillating
CPU clock: f
CSS = 1
Status 5
f
f
XP
R
: Oscillating
: Oscillating
Status 4
2.
3.
4.
5.
MCC = 0
XT
Note 4
Before shifting from status 2 to status 3 after reset and STOP are released, check the high-speed
system clock oscillation stabilization time status using the oscillation stabilization time counter status
register (OSTC).
When shifting from status 2 to status 1, make sure that MCS is 0.
The watchdog timer operates using internal oscillator even in STOP mode if “internal oscillator cannot
be stopped” is selected by the option byte. Internal oscillation clock division can be selected as the
count source of 8-bit timer H1 (TMH1), so clear the watchdog timer using the TMH1 interrupt request
before watchdog timer overflow. If this processing is not performed, an internal reset signal is
generated at watchdog timer overflow after STOP instruction execution.
The operation cannot be shifted between subsystem clock operation and internal oscillation clock
operation.
All reset sources (RESET input, POC, LVI, clock monitor, and WDT)
(4) When “internal oscillator cannot be stopped” is selected by option byte
XT
CSS = 0
CPU clock: f
f
f
XP
R
: Oscillating
: Oscillating
Status 3
HALT instruction
Note 5
HALT instruction
Figure 5-13. Status Transition Diagram (4/4)
XP
Interrupt
instruction
Interrupt
Interrupt
STOP
CHAPTER 5 CLOCK GENERATOR
(when subsystem clock is used)
MCM0 = 1
MCM0 = 0
User’s Manual U16962EJ3V0UD
Interrupt
HALT
instruction
Note 1
instruction
Interrupt
STOP
f
CPU clock: f
f
XP
R
STOP
: Oscillating
Status 2
: Oscillating
HALT
Note 3
Interrupt
HALT
instruction
R
Interrupt
instruction
MSTOP = 1
MSTOP = 0
STOP
Reset release
HALT instruction
Note 2
Interrupt
f
XP
: Oscillation stopped
Reset
CPU clock: f
f
R
: Oscillating
Status 1
Note 5
R
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