Z8018033FSG View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z8018033FSG

Microprocessor Unit

Zilog 

Z80180

Microprocessor Unit

74

I/O Control Register (ICR)

ICR allows relocating of the internal I/O addresses. ICR also controls enabling/disabling of

the IOSTOP mode (Figure 78).

I/O Control Register (ICR: I/O Address = 3Fh)

Bit 7

6

5

4

3

2

1

0

IOA7 IOA6 IOSTP

—

—

—

—

—

R/W R/W R/W

Figure 78. I/O Control Register (ICR: I/O Address = 3Fh)

IOA7, 6: I/O Address Relocation (bits 7,6)

IOA7 and IOA6 relocate internal I/O as illustrated in Figure 79.

Note: The high-order 8 bits of 16-bit internal I/O address are always 0. IOA7 and IOA6 are

cleared to 0 during RESET.

IOA7–IOA6 = 1 1

IOA7–IOA6 = 1 0

IOA7– IOA6 = 0 1

IOA7–IOA6 = 0 0

00FFh

00C0h

00BFh

0080h

0070h

0040h

003Fh

0000h

Figure 79. I/O Address Relocation

IOSTP: IOSTOP Mode (bit 5)—IOSTOP mode is enabled when IOSTP is set to 1. Normal

I/O operation resumes when IOSTOP is reprogrammed or RESET to 0.

PS014004-1106

Architecture

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