UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 174

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

5.7.3 Operating Status
(1) When set as an output port
134
Port 5 is an input/output port, with a dual function as the address bus (A8 to A15).
The output latch is enabled, and data transfers between the output latch and accumulator are performed by means of
transfer instructions. The output latch contents can be freely set by means of logical operation instructions. Once data has
been written to the output latch, it is retained until data is next written to the output latch*.
* Including the case where another bit of the same port is manipulated by a bit manipulation instruction.
Internal
Bus
RD
Figure 5-47 Port Specified as Output Port
OUT
WR
CHAPTER 5 PORT FUNCTIONS
PORT
Output
Latch
P5n
n = 0-7