NEC switch - Releasing HALT Mode by RESET Input; Operation after Release of HALT Mode

CHAPTER 12 STANDBY FUNCTION
User’s Manual U12978EJ3V0UD
182
(c) Releasing by RESET input
When the HALT mode is released by the RESET signal, execution branches to the reset vector address in
the same manner as the ordinary reset operation, and program execution is started.
Figure 12-3. Releasing HALT Mode by RESET Input
HALT
instruction
RESET
signal
Wait
(2
15
/fX : 5.46 ms)
Reset
period
HALT mode
Operation
mode
Oscillation
stabilization
wait status
Clock
Operation
mode
Oscillation
stops
Oscillation
Oscillation
Remarks 1. fX
: System clock oscillation frequency
2. The parenthesized values apply to operation at f
X
= 6.0 MHz.
Table 12-2. Operation After Release of HALT Mode
Releasing Source MKxx IE Operation
Maskable interrupt request 0 0 Executes next address instruction
0 1 Executes interrupt servicing
1 × Retains HALT mode
Non-maskable interrupt request — × Executes interrupt servicing
RESET input ——Reset processing
×: don’t care