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 (s et, 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) functi on: 1 channel
• Three-wired serial I/O mode: 1 channel
Timer • 8-bit timer: 1 channel
• 8-bit timer/event c ounter: 1 channel
• Watchdog timer: 1 channel
Regulator Incorporated (VREG = 3.3 ±0.3 V)
Maskable Internal: 9, external: 2
Vector interrupt
sources Non-maskable I nternal: 1
Power supply voltage VDD = 4.0 to 5.5 V
Operating ambient temperature • TA = –40 to +85°C (when the US B 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 channelNote
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.