CHAPTER 1 GENERAL
User’s Manual U12978EJ3V0UD
27
1.7 Functions
Product
Item
µ
PD789800
µ
PD78F9801
Internal memory
ROM
Mask ROM
8 KB
Flash memory
16 KB
High-speed RAM
256 bytes
Minimum instruction execution time
0.33
µ
s/1.33
µ
s (at 6.0 MHz operation with system clock)
Instruction set
• 16-bit operation
• Bit manipulation (set, reset, and test) etc.
I/O ports
CMOS I/O
31
(Of the above COMS I/O ports, 18 ports can be switched to N-ch open-drain
I/O ports.)
Serial interface
• USB (Universal Serial Bus) function: 1 channel
• Three-wired serial I/O mode:
1 channel
Timer
• 8-bit timer: 1 channel
• 8-bit timer/event counter: 1 channel
• Watchdog timer:
1 channel
Regulator
Incorporated (V
REG
= 3.3
±
0.3 V)
Maskable
Internal: 9, external: 2
Vector interrupt
sources
Non-maskable
Internal: 1
Power supply voltage
V
DD
= 4.0 to 5.5 V
Operating ambient temperature
• T
A
= –40 to
+
85°C (when the USB is not operating)
• T
A
= 0 to
+
70°C (when the USB is operating)
• T
A
= 10 to 40°C (when a flash memory is written)
Package
44-pin plastic LQFP (10
×
10)
An outline of the timer is shown below.
8-Bit Timer 00
8-Bit Timer/
Event Counter 01
Watchdog Timer
Interval timer
1 channel
1 channel
1 channel
Note
Operation mode
External event counter
−−−−
1 channel
−−−−
Timer outputs
−−−−
1 output
−−−−
Square-wave outputs
−−−−
1 output
−−−−
Capture
−−−−
−−−−
−−−−
Function
Interrupt sources
1
1
2
Note
The watchdog timer has watchdog timer and interval timer functions. However, use the watchdog timer by
selecting either the watchdog timer function or interval timer function.
Содержание switch
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