7733 datasheet(329/940 Pages) RENESAS

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This signal is affected by the signal output disable selection bit (bit 6 at address 6C

CONNECTING EXTERNAL DEVICES

7733 Group User’s Manual

12–4

Notes 1: In the memory expansion mode, this pin functions as a programmable I/O port. Furthermore, it can be switched to be a clock

output

pin when selected by software. In the microprocessor mode, this pin is affected by the signal output disable selection bit (bit 6 at address

6C16). (Refer to Table 12.1.5.)

). (Refer to Table 12.1.2.)

Pin name

HLDA

ALE

16 bits

(BYTE = “L”)

8 bits

(BYTE = “H”)

External data

bus width

ALE

RDY

HOLD

RDY

HOLD

(Note 2)

P : Functions as programmable I/O port

P47 to P43

(Note 1)

HLDA

R/W

BHE

P47 to P43

HOLD

RDY

BHE

ALE

R/W

HLDA

A7 to A0

A15/D15 to A8/D8

A15 to A8

D(odd)

D(odd) : Data at odd

address

A15/D15

to A8/D8

A15 to A8

A23/D7 to A16/D0

A23 to A16

D(even)

D(even) : Data at even

address

A23/D7

to A16/D0

A23 to A16

A23/D7

to A16/D0

D : Data

BHE

R/W

Table 12.1.1 Functions of ports P0 to P4 and pin E in memory expansion or microprocessor mode

12.1 Signals required for accessing external devices

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