MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 288

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

286
Internal high-speed
oscillation clock
(b) Release by RESET input
RESET signal
Status of CPU
Note No oscillation stabilization time wait is required when an external input clock is used. The CPU clock,
Note When the internal high-speed oscillation clock is selected as the high-speed system clock, the CPU
RESET signal
Status of CPU
X1 input clock
When the RESET signal is input, STOP mode is released and a reset operation is performed after the
oscillation stabilization time has elapsed.
Remarks 1. f
therefore, may be switched without reading the OSTC value.
clock can be switched from the internal low-speed oscillation clock to the high-speed system clock by
using the MCM0 bit of MCM, after waiting for the reference voltage stabilization time (300 s (MAX.))
and the oscillation stabilization time (50 s (MAX.)) by using software, after a reset release. At this time,
since OSTC cannot be used, execute the NOP instruction 85 times according to the maximum value of
the internal low-speed oscillation clock oscillation frequency (480 kHz), secure a stabilization time, and
then switch the CPU clock.
(Internal high-speed
oscillation clock)
Operating mode
2. f
Operating mode
(X1 input clock)
(2) When Internal high-speed Oscillation clock is used as CPU clock
Oscillates
X
RL
: X1 clock oscillation frequency
: Internal low-speed oscillation clock frequency
Oscillates
Figure 17-7. STOP Mode Release by RESET Input (1/2)
instruction
STOP
(1) When X1 input clock is used as CPU clock
instruction
STOP
Oscillation stopped
Oscillation stopped
CHAPTER 17 STANDBY FUNCTION
STOP mode
(Internal
low-speed
oscillation clock)
STOP mode
User’s Manual U17890EJ2V0UD
Oscillation
stopped
Oscillation stabilization time (2
period
Reset
Oscillation
stopped
period
Reset
Oscillation stabilization wait
Operation
(21/f
stopped
Operation
(21/f
stopped
RL
Oscillates
)
RL
Oscillates
)
(Internal low-speed oscillation clock)
(Internal low-speed oscillation clock)
Operating mode
Operating mode
11
/f
Note
X
to 2
16
/f
X
)
Note