UPD784907 Datasheet, PDF (38/98 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD784907, 784908
8.3 Real-Time Output Port
The real-time output port outputs data stored in the buffer, synchronized with a timer/counter 1 match interrupt or
external interrupt. Thus, pulse output that is free of jitter can be obtained.
Therefore, the real-time output port is best suited to applications (such as open-loop control over stepping motors)
where an arbitrary pattern is output at arbitrary intervals.
As shown in Figure 8-5, the real-time output port is built around port 0 and the port 0 buffer register (P0H, P0L).
Figure 8-5. Block Diagram of Real-Time Output Port
Internal bus
8
4
4
Real-time output port
Port 0 buffer register
control register
8
(RTPC)
P0H
P0L
INTP0 (externally)
INTC10 (from timer/counter 1)
INTC11 (from timer/counter 1)
Output trigger
control circuit
4
4
Output latch (P0)
P07
P00
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Data Sheet U11680EJ2V0DS00