MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 283

• 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

Internal high-speed
oscillation clock
(b) Release by RESET input
Status of CPU
RESET signal
Status of CPU
RESET signal
X1 input clock
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
When the RESET signal is input, HALT mode is released, and then, as in the case with a normal reset
operation, the program is executed after branching to the reset vector address.
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
X
RL
: X1 clock oscillation frequency
: Internal low-speed oscillation clock frequency
Figure 17-4. HALT Mode Release by RESET Input (1/2)
instruction
instruction
HALT
HALT
(1) When X1 input clock is used as CPU clock
Oscillates
Oscillates
HALT mode
CHAPTER 17 STANDBY FUNCTION
HALT mode
User’s Manual U17890EJ2V0UD
Oscillation
stopped
period
Reset
Oscillation
stopped
period
Reset
Oscillation stabilization wait
Operation
Oscillation stabilization time
stopped
(21/f
Operation
stopped
(21/f
(2
RL
)
11
Oscillates
RL
/f
)
Oscillates
X
(Internal low-speed oscillation clock)
to 2
(Internal low-speed oscillation clock)
Operating mode
16
Operating mode
/f
X
)
Note
Note
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