Hardware Configuration; Setting The I/O Mode And Control Mode; Block Diagram Of Port 4; Port 4 Operating Modes - NEC PD78212 User Manual

8-bit single-chip microcomputer sub-series

Table of Contents

µ PD78214 Sub-Series

5.5.1 Hardware Configuration

Fig. 5-21 shows the hardware configuration of port 4.

The memory expansion mode register (MM, see Fig 13-1) specifies the operating mode of port 4, as listed in Table

For the µ PD78213, port 4 functions only as the address/data bus (AD0 through AD7).

Fig. 5-21 Block Diagram of Port 4

Pull-up resistor option register

Output latch

Table 5-5 Port 4 Operating Modes

MM register bit

Operation mode

Address/data bus