• Power supply voltage: VDD = 1.8 to 5.5 V
• Max. frequency: 10 MHz
• ROM capacities: 4 KB to 16 KB flash memory
• RAM capacities: 384 bytes to 768 bytes
• 20-pin plastic SSOP package
• 78K0 CPU core
• Low power consumption (VDD = 3.0 V)
  - Internal high-speed oscillation mode: 260 µA (TYP.) (at  fCPU = 1 MHz operation)
  - STOP mode: 0.7 µA (TYP.) (at fIL = 30 kHz operation)
• Clock
  - High-speed system clock ... Selected from the following three source
  - Ceramic/crystal oscillator: 1 to 10 MHz
  - External clock: 1 to 10 MHz
  - Internal high-speed oscillator: 4 MHz ± 2 % (-20 to +70°C), or 8 MHz ± 5 %(-40 to +85°C)
  - Low-speed system oscillator 30 kHz ± 10 % ... Watchdog timer, timer clock in  intermittent operation
  - Subsystem clock: Clock to operate the real-time counter mainly
• I/O ports:24 (CMOS I/O: 21, CMOS input: 3)
• Timer
  - 16-bit timer/event counter ... Timer output, capture input: 1 channel
  - 8-bit timer H ... PWM output: 1 channel
  - 8-bit timer/event counter 5 ... PWM output, external event counter input: 1 channel
  - Watchdog timer ... Operable with low-speed internal oscillation clock: 1 channel
• Serial interface
  - UART ... Asynchronous 2-wire serial interface: 1 channel
  - IICA ... Clock synchronous 2-wire serial interface, multimaster supported, standby can be released upon address match in slave mode: 1 channel
• 10-bit resolution A/D conversion: 6 channels
• Operational amplifier (products with operational amplifier only): 2 channels
• Power-on-clear (POC) circuit
• Low-voltage detector (LVI) (An interrupt/reset (selectable) is generated when the detection voltage is reached))
  - Detection voltage: Selectable from sixteen levels between 1.91 and 4.22 V
• Single-power-supply flash memory
  - Flash self programming enabled
  - Software protection function: Protected from outside party copying (no flash reading command)
• Safety function
  - Watchdog timer operated by clock independent from CPU ... A hang-up can be detected even if the system clock stops
  - Supply voltage drop detectable by LVI ... Appropriate processing can be executed before the supply voltage drops below the operation voltage
  - Equipped with option byte function ... Important system operation settings set in hardware
• On-chip debug function ... Available to control for the target device, and to reference memory
• Operating ambient temperature: TA = -40 to +85°C