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CHAPTER 1 GENERAL (
µ
PD78054 Subseries)
1.1 Features
On-chip high-capacity ROM and RAM
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
µ
s: In main system clock 5.0 MHz operation)
to ultra-low speed (122
µ
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: VDD = 2.0 to 6.0 V
Program Memory
(ROM)
Part Number
Type
µ
PD78052
µ
PD78053
µ
PD78054
µ
PD78P054
µ
PD78055
µ
PD78056
µ
PD78058
µ
PD78P058
16 Kbytes
24 Kbytes
32 Kbytes
32 Kbytes
Note1
40 Kbytes
48 Kbytes
60 Kbytes
60 Kbytes
Note1
512 bytes
1024 bytes
1024 bytes
Note1
1024 bytes
1024 bytes
Note1
Internal High-Speed RAM Internal Buffer RAM Internal Expansion RAM
32 bytes None
1024 bytes
1024 bytes
Note2
Data Memory