UPD78320 datasheet(8/88 Pages) NEC

8 / 88 page

µPD78320, 78322

DIFFERENCES BETWEEN

µPD78322 AND 78320

µPD78322

µPD78320

16K bytes

None

16 (dual-function as analog input: 8)

Specifiable as I/O as an 8-bit unit.

Functions as multiplexed address/data buses

Functions always as multiplexed address/data

(AD0 to AD7) in the external memory expansion

buses.

mode.

Specifiable as I/O bit-wise.

Functions as address bus (A8 to A15) in the

Functions always as address bus.

external memory expansion mode.

Specifiable as I/O bit-wise.

In the external memory expansion mode, P90

and P91 function as RD strobe signal output and

WR strobe signal output, respectively. In the

external memory high-speed fetch mode, P92

and P93 function as TAS output and TMD

output, respectively.

In the

µPD78322 emulation mode, turbo

access manager (

µPD71P301)Note PA and PB pins

are controlled as port 4 and port 5 emulation

pins.

Item

I/O line

Product Name

Always P90 and P91 function as RD strobe and

WR strobe signal output, respectively.

Port 4 I/O mode is set as an 8-bit unit .

Port 5 I/O mode is set bit-wise.

Internal ROM

Input

/output

Port 4

(P40 to P47)

Port 5

(P50 to P57)

Port 9

(P90 to P93)

Memory expansion

mode register (MM)

Port 5 mode register

(PM5)

Note Maintenance product

UPD78320 Datasheet(PDF) 8 Page - NEC

UPD78320 Datasheet(HTML) 8 Page - NEC

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