UPD78320 Datasheet, PDF (8/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
DIFFERENCES BETWEEN µPD78322 AND 78320
Item
Product Name
Internal ROM
µPD78322
16K bytes
µPD78320
None
I/O line
Input
Input
/output
16 (dual-function as analog input: 8)
39
21
Port 4
(P40 to P47)
Specifiable as I/O as an 8-bit unit.
Functions as multiplexed address/data buses
(AD0 to AD7) in the external memory expansion
mode.
Functions always as multiplexed address/data
buses.
Port 5
(P50 to P57)
Specifiable as I/O bit-wise.
Functions as address bus (A8 to A15) in the
external memory expansion mode.
Functions always as address bus.
Port 9
(P90 to P93)
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.
Memory expansion
mode register (MM)
Port 4 I/O mode is set as an 8-bit unit .
Port 5 mode register
Port 5 I/O mode is set bit-wise.
(PM5)
Always P90 and P91 function as RD strobe and
WR strobe signal 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.
Note Maintenance product
8