CHAPTER 14 STANDBY FUNCTION
User’s Manual U17446EJ3V1UD
240
(b) Release by reset signal generation
When the reset signal is generated, 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.
Figure 14-3. HALT Mode Release by Reset Signal Generation
(1) When CPU clock is high-speed internal oscillation clock or external input clock
HALT
instruction
Reset signal
System clock
oscillation
Operation
mode
HALT mode
Reset
period
Operation mode
Oscillates
Oscillation stops
Oscillates
CPU status
Operation
stops
Note
Note
Operation is stopped (277
μ
s (MIN.), 544
μ
s (TYP.), 1.075 ms (MAX.)) because the option byte is
referenced.
(2) When CPU clock is crystal/ceramic oscillation clock
HALT
instruction
Reset signal
System clock
oscillation
Operation
mode
HALT mode
Reset
period
Operation
stops
Note
Oscillation
stabilization waits
Oscillates
Oscillation stops
Oscillates
CPU status
Oscillation stabilization time
(2
10
/f
X
to 2
17
/f
X
)
Operation
mode
Note
Operation is stopped (276
μ
s (MIN.), 544
μ
s (TYP.), 1.074 ms (MAX.)) because the option byte is
referenced.
Remark
f
X
: System clock oscillation frequency
Table 14-3. Operation in Response to Interrupt Request in HALT Mode
Release Source
MK
××
IE
Operation
0
0
Next address instruction execution
0
1
Interrupt servicing execution
Maskable interrupt request
1
×
HALT mode held
Reset signal generation
−
×
Reset processing
×
: don’t care
Содержание 78K0S/KB1+
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