UPD784218 Datasheet, PDF (34/92 Pages) NEC – 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784218, 784218Y
8.3 Real-Time Output Port
The real-time output function is to transfer data preset in the real-time output buffer register to the output latch
as soon as the timer interrupt or external interrupt has occurred in order to output the data to an external device.
The pins that output the data to the external device constitute a port called a real-time output port.
Because the real-time output port can output signals without jitter, it is ideal for controlling stepper motors, etc.
Figure 8-5. Block Diagram of Real-Time Output Port
RTPOE BYTE
Internal bus
Real-time output port
control register (RTPC)
EXTR
INTP2TRG
INTTM1
INTTM2
Output trigger
controller
Higher 4 bits of
real-time output
buffer register
(RTBH)
Lower 4 bits of
real-time output
buffer register
(RTBL)
Real-time output
port mode register
(RTPM)
Port 12 output latch
Real-time output port output latch
P127······································ P120 RTP7······································ RTP0
RTPOE bit
P12n/RTPn pin output (n = 0 to 7)
PR1T2P77/······································
P120/
RTP0
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Data Sheet U12304EJ2V0DS00