Chapter 1 General ( Pd78054 Subseries); Features - NEC PD78052 User Manual

1.1 Features

On-chip high-capacity ROM and RAM
Type
Program Memory
(ROM)
Part Number
PD78052 16 Kbytes
PD78053 24 Kbytes
PD78054 32 Kbytes
PD78P054 32 Kbytes
PD78055 40 Kbytes
PD78056 48 Kbytes
PD78058 60 Kbytes
PD78P058 60 Kbytes
Notes 1. The capacities of internal PROM and internal high-speed RAM can be changed by means of the
memory size switching register (IMS).
2. The capacity of internal high-speed RAM can be changed by means of the internal expansion RAM
size switching register (IXS).
External Memory Expansion Space: 64 Kbytes
Minimum instruction execution time changeable from high speed (0.4 s: In main system clock 5.0 MHz operation)
to ultra-low speed (122 s: In subsystem clock 32.768 kHz operation)
Instruction set suited to system control
• Bit manipulation possible in all address spaces
• Multiply and divide instructions
69 I/O ports: (4 N-ch open-drain ports)
8-bit resolution A/D converter: 8 channels
8-bit resolution D/A converter: 2 channels
Serial interface: 3 channels
• 3-wire serial I/O/SBI/2-wire serial I/O mode: 1 channel
• 3-wire serial I/O mode (Automatic transmit/receive function): 1 channel
• 3-wire serial I/O/UART mode: 1 channel
Timer: 5 channels
• 16-bit timer/event counter : 1 channel
• 8-bit timer/event counter : 2 channels
• Watch timer : 1 channel
• Watchdog timer : 1 channel
22 vectored interrupt sources
2 test inputs
Two types of on-chip clock oscillators (main system clock and subsystem clock)
Supply voltage: V = 2.0 to 6.0 V
DD

CHAPTER 1 GENERAL ( PD78054 Subseries)

Internal High-Speed RAM
512 bytes
1024 bytes
Note1
Note1
1024 bytes
1024 bytes
Note1
Note1
1024 bytes
Data Memory
Internal Buffer RAM Internal Expansion RAM
32 bytes None
1024 bytes
1024 bytes
Note2
37