Operation After A Standby Mode Is Released; Wait Time When The Stop Mode Is Released; Selection Of A Wait Time With Btm - NEC PD750004 User Manual

BTM3 BTM2 BTM1
– 0 0
– 0 1
– 1 0
– 1 1
Other than above
Note This time does not include the time from the release of the STOP mode to the start of oscillation.
Caution The wait times used when the STOP mode is released do not include the time (a in Figure7-
2) required before clock oscillation is started following the release of the STOP mode,
regardless of whether the STOP mode is released by a RESET signal or the generation of
an interrupt.

7.3 OPERATION AFTER A STANDBY MODE IS RELEASED

(1) If a standby mode is released by a RESET signal, normal reset operation is performed.
(2) If a standby mode is released by the occurrence of an interrupt request, the contents of the interrupt master
enable flag (IME) determines whether to perform a vectored interrupt when the CPU resumes instruction
execution.
(a) When IME = 0
If a standby mode is released, execution restarts with the instruction immediately following the
instruction used to set the standby mode.
The interrupt request flag is held.
(b) When IME = 1
If a standby mode is released, a vectored interrupt is executed after the two instructions are executed.
However, if the standby mode is released by INT2 or INTW (testable input), no vectored interrupt
occurs, and the same processing as (a) above is performed.
Table 7-2. Selection of a Wait Time with BTM
BTM0
( ) indicates the value for f
6.00 MHz
20
0 Approx. 2 /f
17
1 Approx. 2 /f
15
1 Approx. 2 /f
13
1 Approx. 2 /f
Not to be set
Figure 7-2. Wait Time When the STOP Mode Is Released
Waveform
at the X1 pin
V
SS
Wait time
=
X
(Approx. 175 ms)
X
(Approx. 21.8 ms)
X
(Approx. 5.46 ms)
X
(Approx. 1.37 ms)
X
STOP mode release
a
CHAPTER 7 STANDBY FUNCTION
Note
( ) indicates the value for f
4.19 MHz
20
Approx. 2 /f (Approx. 250 ms)
X
17
Approx. 2 /f (Approx. 31.3 ms)
X
15
Approx. 2 /f (Approx. 7.81 ms)
X
13
Approx. 2 /f (Approx. 1.95 ms)
X
=
X
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