UPD78323 NEC, UPD78323 Datasheet - Page 7

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

DIFFERENCES BETWEEN PD78324 AND 78323
Note Maintenance product
Internal ROM
I/O line
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)
Item
Product Name
Input
Input
/output
Port 4 I/O mode is set as an 8-bit unit .
Port 5 I/O mode is set bit-wise.
Specifiable as I/O as an 8-bit unit.
Functions as multiplexed address/data buses
(AD0 to AD7) in the external memory expansion
mode.
Specifiable as I/O bit-wise.
Functions as address bus (A8 to A15) in the
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 P93 function as TAS output and TMD out-
put respectively.
32K bytes
PD78324
39
16 (dual-function as analog input: 8)
Functions always as multiplexed address/data
buses.
Functions always as address bus.
Always P90 and P91 function as RD strobe and
WR strobe signal output, respectively.
In the PD78324 emulation mode, turbo acces
acces manager ( PD71P301)
are controlled as port 4 and port 5 emulation
pins.
21
PD78323
None
PD78323, 78324
Note
PA and PB pins
7