upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 342

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

342
(b) Release by RESET input
Internal oscillation
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.
Note Waiting for the oscillation stabilization time is not required when the external RC oscillation clock is
Remarks 1. f
RESET signal
Status of CPU
RESET signal
Status of CPU
system clock
High-speed
selected as the high-speed system clock by the option byte. Therefore, the CPU clock can be
switched without reading the OSTC value.
(high-speed system clock)
2. f
clock
(internal oscillation clock)
XP
R
: Internal oscillation clock oscillation frequency
: High-speed system clock oscillation frequency
Operating mode
Operating mode
(1) When high-speed system clock is used as CPU clock
(2) When internal oscillation clock is used as CPU clock
Figure 17-4. HALT Mode Release by RESET Input (1/2)
instruction
instruction
HALT
HALT
CHAPTER 17 STANDBY FUNCTION
Oscillates
Oscillates
User’s Manual U16961EJ4V0UD
HALT mode
HALT mode
Oscillation
stopped
period
Reset
Oscillation
stopped
period
Reset
Oscillation stabilization time
Operation
stopped
(17/f
Operation
stopped
(17/f
(2
R
11
)
Oscillates
/f
R
XP
)
Oscillates
to 2
(internal oscillation clock)
16
(internal oscillation clock)
/f
Operating mode
XP
Operating mode
)
Note