UPD75P4308GS datasheet(14/60 Pages) NEC

14 / 60 page

µPD75P4308

5. DIFFERENCES BETWEEN

µPD75P4308 AND µPD754302, 754304

The

µPD75P4308 replaces the internal mask ROM in the µPD754302 and 754304 with a one-time PROM and

features expanded ROM capacity. The

µPD75P4308’s Mk I mode supports the Mk I mode in the µPD754302 and

754304 and the

µPD75P4308’s Mk II mode supports the Mk II mode in the µPD754302 and 754304.

Table 5-1 lists differences among the

µPD75P4308 and the µPD754302 and 754304. Be sure to check the

differences between corresponding versions beforehand, especially when a PROM version is used for debugging or

prototype testing of application systems and later the corresponding mask ROM version is used for full-scale

production.

For details of CPU functions and incorporated hardware, refer to

µPD754304 User’s Manual (U10123E).

Table 5-1. Differences between

µPD75P4308 and µPD754302, 754304

Item

µPD754302

µPD754304

µPD75P4308

Program counter

11-bit

12-bit

13-bit

Program memory (bytes)

Mask ROM

One-time PROM

2048

4096

8192

Data memory (

× 4 bits)

256

Mask options

Pull-up resistor for

Yes (On-chip/not on-chip specifiable)

No (On-chip not possible)

PORT5

Wait time in

Yes (Selectable from 217/fX and 215/fX)Note

No (fixed at 215/fX)Note

RESET state

Pin configuration

Pins 5 to 8

P33-P30

P33/MD3-P30/MD0

Pin 19

VPP

Pins 29 to 32

P63/KR3-P60/KR0

P63/KR3/D3-

P60/KR0/D0

Pins 33 to 36

P53-P50

P53/D7-P50/D4

Other

Noise resistance and noise radiation may differ due to the different circuit

complexities and mask layouts.

Note 217/fX: 21.8 ms @6.0-MHz operation, 31.3 ms @4.19-MHz operation.

215/fX: 5.46 ms @6.0-MHz operation, 7.81 ms @4.19-MHz operation.

Caution Noise resistance and noise radiation are different in PROM version and mask ROM versions. If

using a mask ROM version instead of the PROM version for processes between prototype

development and full production, be sure to fully evaluate the CS (not ES) of the mask ROM

version.

UPD75P4308GS Datasheet(PDF) 14 Page - NEC

UPD75P4308GS Datasheet(HTML) 14 Page - NEC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Datasheet Download

Link URL