COP87L88RW Datasheet, PDF (19/42 Pages) National Semiconductor (TI) – 8-Bit One-Time Programmable OTP Microcontroller with Pulse Train Generators and Capture Modules

Power Save Modes (Continued)
As with the HALT mode the device can be returned to nor-
mal operation with a reset or with a Multi-Input Wake up
from the L Port Alternately the microcontroller resumes
normal operation from the IDLE mode when the thirteenth
bit (representing 4 096 ms at internal clock frequency of
10 MHz t_c e 1 ms) of the IDLE Timer toggles
This toggle condition of the thirteenth bit of the IDLE Timer
T0 is latched into the T0PND pending flag
The user has the option of being interrupted with a transition
on the thirteenth bit of the IDLE Timer T0 The interrupt can
be enabled or disabled via the T0EN control bit Setting the
T0EN flag enables the interrupt and vice versa
The user can enter the IDLE mode with the Timer T0 inter-
rupt enabled In this case when the T0PND bit gets set the
device will first execute the Timer T0 interrupt service rou-
tine and then return to the instruction following the ‘‘Enter
Idle Mode’’ instruction
Alternatively the user can enter the IDLE mode with the
IDLE Timer T0 interrupt disabled In this case the device
will resume normal operation with the instruction immediate-
ly following the ‘‘Enter IDLE Mode’’ instruction
Note It is necessary to program two NOP instructions following both the set
HALT mode and set IDLE mode instructions These NOP instructions
are necessary to allow clock resynchronization following the HALT or
IDLE modes
Multi-Input Wakeup
The Multi-Input Wake Up feature is used to return (wake up)
the device from either the HALT or IDLE modes Alternately
Multi-Input Wake Up Interrupt feature may also be used to
generate up to 8 edge selectable external interrupts
Figure 13 shows the Multi-Input Wake Up logic
FIGURE 13 Multi-Input Wake Up Logic
TL DD 12855 – 13
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