UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 207

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

6.6 CAUTIONS
(1) When P0ML and P0MH bits are set (1), the corresponding port output buffer is turned on and the port 0 output latch
(2) When the port is specified as a real-time output port, values cannot be directly written to the output latch by software.
contents are output irrespective of the contents of the port 0 mode register (PM0). The output latch contents should
therefore be initialized before making a real-time output port specification.
Therefore, the initial value of the output latch must be set in software before specifying use as a real-time output port.
Also, if the need arises to forcibly set the output data to a fixed value while the port is being used as a real-time output
port, you should change the port to a normal output port by manipulating the real-time output port control register (RTPC),
then write the value to be output to the output latch.
Figure 6-9 Interrupt Request Processing when Real-Time Output Function is Used
CHAPTER 6 REAL-TIME OUTPUT FUNCTION
Assign next value to be output
to P0L
Interval time setting
Timer interrupt
Return
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