UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 172

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

5.7 PORT 5
register (PM5). Each pin incorporates a software programmable pull-up resistor. This port has direct LED drive capability.
5.7.1 Hardware Configuration
132
Port 5 is an 8-bit input/output port with an output latch. Input/output can be specified bit-wise by means of the port 5 mode
In addition, P50 to P57 function as the address bus (A8 to A15) when external memory or I/Os are extended.
In the PD784021, these pins only function as the address bus (A8 to A15).
When RESET is input, port 5 is set as an input port (output high-impedance state), and the output latch contents are undefined.
The port 5 hardware configuration is shown in Figure 5-45.
Internal
Data
Bus
WR
WR
RD
WR
RD
Internal
Address
Bus
PUO
PM5n
PUO
P5n
P5n
Pull-Up Resistor Option Register
PUO5
Port 5 Mode Register
Output Latch
PM5n
P5n
Figure 5-45 Port 5 Block Diagram
CHAPTER 5 PORT FUNCTIONS
MM0-MM3
Input/
Output
Control
Circuit
V
DD
P5n
n = 0-7