Other Functions - NEC PD750004 User Manual

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5.3.6 Other Functions

The basic interval timer/watchdog has the following functions regardless of whether it operates as a basic
interval timer or watchdog timer:
<1> Selecting and counting the wait time after the standby mode is released
<2> Reading the count
(1) Selecting and counting the wait time after the STOP mode is released
To allow the system clock to stabilize after releasing the STOP mode, a wait function is available which
stops the operation of the CPU until the basic interval timer (BT) overflows.
The wait time after generation of a RESET signal is fixed as specified by a mask option. On the other
hand, a wait time can be selected by setting BTM when releasing the STOP mode with an interrupt
occurrence. In this case, the wait times are the same as the interval times shown in Figure 5-24. BTM
must be set before the STOP mode is set. (For details, see Chapter 7.)
Example Set the wait time 5.46 ms (at 6.00 MHz) in releasing the STOP mode with an interrupt.
SET1
SEL
MOV
MOV
STOP
NOP
SET1 MBE
SEL MB15
SET1 BTM.3
SET1 MBE
SEL MB15
SET1 BTM.3
MBE
MB15
A, #1101B
BTM, A ; Set wait time
; Set STOP mode
CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
Processing completes
within 5.46 ms.
Processing completes
within 5.46 ms.
103