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76
CHAPTER 1 FEATURES OF 78K/IV SERIES PRODUCTS
1.12.4 Outline of functions
(1/2)
Product Name
Item
μ
PD784907
μ
PD784908
μ
PD78P4908
Number of basic instructions (mnemonics)
113
General registers
8 bits
×
16 registers
×
8 banks or 16 bits
×
8 registers
×
8 banks (memory mapping)
Minimum instruction execution time
160 ns/320 ns/636 ns/1.27
μ
s (at 12.58-kHz operation)
Internal memory
capacity
ROM
92 Kbytes
(Mask ROM)
128 Kbytes
(Mask ROM)
128 Kbytes
(PROM)
RAM
3,584 bytes
4,352 bytes
Memory space
1 Mbyte in total of program and data
I/O ports
Total
80
Inputs
8
I/O
72
Pins with added
functions
Note
LED direct drive
outputs
24
Transistor direct drive
8
N-ch open-drain
4
Real-time output ports
4 bits
×
2, or 8 bits
×
1
IEBus controller
Internal (simplify)
Timer/counters
Timer/counter 0: Timer register
×
1
(16 bits)
Pulse output capability
Toggle output
PWM/PPG output
One-shot pulse output
Capture register
×
1
Compare register
×
2
Timer/counter 1: Timer register
×
1
(16 bits)
Real-time output port
Capture register
×
1
Capture/compare register
×
1
Compare register
×
1
Timer/counter 2: Timer register
×
1
Pulse output capability
Toggle output
Capture register
×
1
Capture/compare register
×
1 PWM/PPG output
Compare register
×
1
Timer 3:
Timer register
×
1
Compare register
×
1
Watch timer
Interrupt occurs at an interval of 0.5 sec. (Has an internal clock oscillator.)
The input clock can be selected from among the main clock
(12.58 MHz) or clock (32.7 kHz).
Clock output
Selectable from f
CLK
, f
CLK
/2, f
CLK
/4, f
CLK
/8, f
CLK
/16, (also usable as output port)
PWM output
12-bit resolution
×
2 channels
Serial interfaces
UART/IOE (3-wire serial I/O): 2 channels (on-chip baud rate generator)
CSI (3-wire serial I/O): 2 channels
A/D converter
8-bit resolution
×
8 channels
Watchdog timer
1 channel
Standby function
HALT/STOP/IDLE mode
Note
The pins with additional functions are included in the I/O pins.