Table 3.2.0A Selecting The High-Order Address Bit Output Control - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

3.2.2.2 External address output control register
Address: 0000A6
H
Read/write
Initial value
This register controls the external output of addresses (A19 to A16). The bits corresponds to addresses
A19 to A16, controlling the address output pins as described below.

Table 3.2.0a Selecting the high-order address bit output control

This register cannot be accessed when the device is in single chip mode. In that case, all pins are used as
I/O ports regardless of the value of this register.
All bits of this register are write-only bits. '1' is always read from these bits.
These bits are initialized to '0' upon a reset.
MB90580 Series
7 6
E23 E22
(W) (W)
(0) (0)
0 The corresponding pin is used as an address output (Axx).
1 The corresponding pin is used as an I/O port (Pxx).
5 4 3
E21 E20 E19
(W) (W) (W)
(0) (0) (0)
3.2 External Memory Access
2 1 0
E18 E17 E16
(W) (W) (W)
(0) (0) (0)
Chapter 3: Memory
Bit No.
HACR
39