Z86L86 データシートの表示（PDF） - Zilog

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Z86L86

IR/LOW-VOLTAGE MICROCONTROLLER

Zilog 

Z86L88/81/86/87/89/73

IR/Low-Voltage Microcontroller

PIN FUNCTIONS (Continued)

Port 1 (P17-P10). Port 1 is a multiplexed Address (A7-A0)

and Data (D7-D0), CMOS compatible port. Port 1 is dedi-

cated to the Zilog ZBus®-compatible memory interface.

The operations of Port 1 are supported by the Address

Strobe (/AS) and Data Strobe (/DS) lines, and by the

Read/Write (R//W) and Data Memory (/DM) control lines.

Data memory read/write operations are done through this

port (Figure 14). If more than 256 external locations are re-

quired, Port 0 outputs the additional lines.

Port 1 can be placed in the high-impedance state along

with Port 0, /AS, /DS, and R//W, allowing the Z86LXX to

share common resources in multiprocessor and DMA ap-

plications. Port1 can also be configured for standard port

output mode..

8

Z86LXX

MCU

Port 1

(I/O or AD7 - AD0)

Optional

Handshake Controls

/DAV1 and RDY1

(P33 and P34)

OEN

PAD

Out

In

R ≈ 500 KΩ

Figure 14. Port 1 Configuration

Auto Latch

20

PRELIMINARY

DS96LV00800

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