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CHAPTER 2 GENERAL (
µ
PD78054Y Subseries)
2.1 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
I/O ports: 69 (N-ch open-drain ports: 4)
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/2-wire serial I/O/I
2
C bus 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: Five 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
512 bytes
1024 bytes
1024 bytes
Note 1
16 Kbytes
24 Kbytes
32 Kbytes
40 Kbytes
48 Kbytes
60 Kbytes
60 Kbytes
Note 1
Internal High-Speed RAM Internal Buffer RAM Internal Expansion RAM
32 bytes None
Program Memory
(ROM)
Data Memory
Part Number
Type
µ
PD78052Y
µ
PD78053Y
µ
PD78054Y
µ
PD78055Y
µ
PD78056Y
µ
PD78058Y
µ
PD78P058Y
1024 bytes
1024 bytes
Note 2