UPD75P0076 Datasheet, PDF (15/62 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER

µPD75P0076
5. DIFFERENCES BETWEEN µPD75P0076 AND µPD750064, 750066 AND 750068
The µPD75P0076 replaces the internal mask ROM in the µPD750064, 750066, and 750068 with a one-time PROM and
features expanded ROM capacity. The µPD75P0076’s Mk I mode supports the Mk I mode in the µPD750064, 750066,
and 750068 and the µPD75P0076’s Mk II mode supports the Mk II mode in the µPD750064, 750066, and 750068.
Table 5-1 lists differences among the µPD75P0076 and the µPD750064, 750066, 750068. 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 further description of CPU functions and internal hardware, see the µPD750064 and 750068 Preliminary Product
Information (U10165E).
Table 5-1. Differences between µPD75P0076 and µPD750064, 750066, 750068
Item
Program counter
Program memory (bytes)
Data memory (x 4 bits)
Mask options
Pull-up resistor for
ports 4 and 5
Wait time when
RESET
Feedback resistor of
subsystem clock
Pin configuration Pins 6 to 9
Pin 20
Pins 34 to 37
Pins 38 to 41
Other
µPD750064
µPD750066
12-bit
Mask ROM
4096
Mask ROM
6144
512
Yes (on-chip specifiable)
µPD750068
13-bit
Mask ROM
8192
µPD75P0076
14-bit
One-time PROM
16384
No (off chip)
Yes (2¹⁷/fX, 2¹⁵/fX selectable)^Note
No (fixed at 2¹⁵/fX)^Note
Yes (Use/not use selectable)
No (Use)
P33 to P30
P33/MD3 to P30/MD0
IC
VPP
P53 to P50
P53/D7 to P53/D4
P43 to P40
P43/D3 to P40/D0
Noise resistance and noise radiation may differ due to different circuit complexities
and mask layouts.
Note 2¹⁷/fX is 21.8 ms in 6.0 MHz operation and 31.3 ms in 4.19 MHz operation.
2¹⁵/fX is 5.46 ms in 6.0 MHz operation and 7.81 ms in 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 of the mask ROM version (not ES).
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