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