7733 Datasheet, PDF (329/940 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

CONNECTING EXTERNAL DEVICES
12.1 Signals required for accessing external devices
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Table 12.1.1 Functions of ports P0 to P4 and pin E in memory expansion or microprocessor mode
External data
bus width
Pin name
16 bits
(BYTE = “L”)
8 bits
(BYTE = “H”)
A7 to A0
A7 to A0
A7 to A0
A15/D15
A15/D15 to A8/D8 to A8/D8
A23/D7
A23/D7 to A16/D0 to A16/D0
A15 to A8
D(odd)
D(odd) : Data at odd
address
A23 to A16 D(even)
D(even) : Data at even
address
A15 to A8
A23/D7
to A16/D0
A15 to A8
A23 to A16
D
D : Data
HLDA
ALE
BHE
R/W
HLDA
ALE
BHE
R/W
HLDA
ALE
BHE
R/W
P47 to P43
1
RDY
HOLD
P47 to P43
P
P : Functions as programmable I/O port
1
1
(Note 1)
RDY
RDY
HOLD
HOLD
E
E
(Note 2)
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 1 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.)
2: This signal is affected by the signal output disable selection bit (bit 6 at address 6C 16). (Refer to Table 12.1.2.)
12–4
7733 Group User’s Manual