UPD78F0138 NEC, UPD78F0138 Datasheet - Page 387

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

(b) Release by RESET input
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
Ring-OSC clock
RESET signal
Status of CPU
X1 input clock
Status of CPU
RESET signal
2. f
XP
R
: Ring-OSC clock oscillation frequency
: X1 input clock oscillation frequency
(Ring-OSC clock)
Operating mode
(X1 input clock)
Operating mode
Figure 19-4. HALT Mode Release by RESET Input (1/2)
(2) When Ring-OSC clock is used as CPU clock
(1) When X1 input clock is used as CPU clock
instruction
instruction
HALT
HALT
CHAPTER 19 STANDBY FUNCTION
Oscillates
Oscillates
User’s Manual U16228EJ2V0UD
HALT mode
HALT mode
Oscillation
stopped
period
Oscillation
Reset
stopped
period
Reset
Oscillation stabilization time
Operation
stopped
(17/f
Operation
stopped
(17/f
(2
R
11
)
Oscillates
/f
R
)
XP
Oscillates
to 2
16
(Ring-OSC clock)
/f
Operating mode
XP
Operating mode
(Ring-OSC clock)
)
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