UPD784044 Datasheet, PDF (32/90 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784044(A), 784046(A)
7.3 Real-Time Output Port
The real-time output port outputs the data stored in the buffer in synchronization with a match interrupt of
timer 4. This allows jitter-less pulse output to be obtained.
Therefore, it is best suited to applications that output patterns at given intervals (such as stepping motor open
loop control,etc.).
As shown in Figure 7-4, port 0 and the port 0 buffer register form the core of configuration.
Figure 7-4. Block Diagram of Real-Time Output Port
Internal Bus
8
4
INTCM40 (from timer 4)
Real time output port
control register (RTPC)
Output trigger
control circuit
Port 0 buffer
register (P0L)
4
4
Output latch (P0)
RTP3 RTP2 RTP1 RTP0
7.4 Timer/Counter
The µPD784046(A) contains two 16-bit timer/counter units and three 16-bit timer units.
These units support a total of 15 interrupt requests, which enable them to function as 15-channel timers.
Table 7-2. Timer/Counter Function
Item
Name
Operating mode Interval timer
External event counter
Function
Timer output
Toggle output
Set/reset output
PWM/PPG output
Real-time output
Overflow interrupt
Number of interrupt requests
Timer 0
4ch
–
4ch
–
–
5
Timer 1 Timer/ Timer/ Timer 4
Counter2 Counter 3
2ch
2ch
2ch
2ch
–
–
2ch
2ch
2ch
–
–
–
–
–
–
–
–
–
–
–
–
3
2
2
3
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