Chapter 1 Outline; Features - NEC 78K0 Series User Manual

1.1 Features

Minimum instruction execution time can be changed from high speed (0.1
speed system clock) to ultra low-speed (122
General-purpose register: 8 bits × 32 registers (8 bits × 8 registers × 4 banks)
ROM, RAM capacities
Part Number
µ
PD78F0531
µ
PD78F0532
µ
PD78F0533
µ
PD78F0534
µ
PD78F0535
µ
PD78F0536
µ
PD78F0537, 78F0537D
Note The internal flash memory, internal high-speed RAM capacities, and internal expansion RAM capacities
can be changed using the internal memory size switching register (IMS) and the internal expansion RAM
size switching register (IXS). For IMS and IXS, see 26.1 Memory Size Switching Register and 26.2
Internal Expansion RAM Size Switching Register.
On-chip single-power-supply flash memory
Self-programming (with boot swap function)
On-chip debug function (
On-chip power-on-clear (POC) circuit and low-voltage detector (LVI)
On-chip watchdog timer (operable with the on-chip internal low-speed oscillation clock)
On-chip multiplier/divider (16 bits × 16 bits, 32 bits / 16 bits)
µ
( PD78F0534, 78F0535, 78F0536, 78F0537, 78F0537D only)
On-chip key interrupt function
On-chip clock output/buzzer output controller
I/O ports: 55 (N-ch open drain: 4)
µ
Note The PD78F0537D has an on-chip debug function. Do not use this product for mass production because its
reliability cannot be guaranteed after the on-chip debug function has been used, from the viewpoint of the
restriction on the number of times the flash memory can be rewritten. NEC Electronics does not accept any
complaint about this product.

CHAPTER 1 OUTLINE

µ
s: @ 32.768 kHz operation with subsystem clock)
Item Program Memory
(ROM)
Note
Flash memory 16 KB
24 KB
32 KB
48 KB
60 KB
96 KB
128 KB
µ
Note
PD78F0537D only)
Preliminary User's Manual U17260EJ3V1UD
µ
s: @ 20 MHz operation with high-
Data Memory
Note
Internal High-Speed RAM
768 bytes
1 KB
Note
Internal Expansion RAM
−
1 KB
2 KB
4 KB
6 KB
17