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R8C/LA3A

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Table 1. Specifications for R8C/LA3A Group

Item Function Specification
CPU Central
processing
unit
R8C CPU core
  • Number of fundamental instructions: 89
  • Minimum instruction execution time:
    50 ns (f(XIN) = 20 MHz, VCC = 2.7 to 5.5 V)
    125 ns (f(XIN) = 8 MHz, VCC =1.8 to 5.5 V)
  • Multiplier: 16 bits × 16 bits → 32 bits
  • Multiply-accumulate instruction: 16 bits × 16 bits + 32 bits → 32 bits
  • Operation mode: Single-chip mode (address space: 1 Mbyte)
Memory ROM, RAM,
Data Flash
See Product Lineup.
Power
Supply
Voltage
Detection
Voltage
detection
circuit
  • Power-on reset
  • Voltage detection 3 (detection level of voltage detection 0 and
    voltage detection 1 selectable)
I/O Ports Programmable
I/O ports
  • CMOS I/O ports: 26, selectable pull-up resistor(1)
  • High current drive ports: 8
Clock Clock
generation
circuits
  • 4 circuits:
    XIN clock oscillation circuit
    XCIN clock oscillation circuit (32 kHz)
    High-speed On-chip oscillator (with frequency adjustment function)
    Low-speed on-chip oscillator
  • Oscillation stop detection: XIN clock oscillation stop detection function
  • Frequency divider circuit: Division ratio selectable from 1, 2, 4, 8, and 16
  • Low power consumption modes:
    Standard operating mode (high-speed clock, low-speed clock,
    high-speed on-chip oscillator, low-speed on-chip oscillator), wait mode, stop mode, power-off mode
Real-time clock (timer RH)
Interrupts
  • Number of interrupt vectors: 69
  • External interrupt: 13 (INT × 5, Key input × 8)
  • Priority levels: 7 levels
Watchdog Timer
  • 14 bits × 1 (with prescaler)
  • Selectable reset start function
  • Selectable low-speed on-chip oscillator for watchdog timer
Timer
Timer RB0,
Timer RB1
8 bits × 2 (with 8-bit prescaler)
Timer mode (period timer), programmable waveform generation mode (PWM output),
programmable one-shot generation mode, programmable wait one-shot generation mode
Timer RC
16 bits × 1 (with 4 capture/compare registers)
Timer mode (input capture function, output compare function),
PWM mode (output: 3 pins), PWM2 mode (PWM output: 1 pin)
Timer RH Real-time clock mode (counting of seconds, minutes, hours, day of the week, date,
month, year), output compare mode
Timer RJ0,
Timer RJ1
16 bits × 2 (Timer RJ0 and Timer RJ1)
Timer mode (period timer), pulse output mode (output level inverted every period),
event counter mode, pulse width measurement mode, pulse period measurement mode
Serial
Interface
UART0
1 channel
Clock synchronous serial I/O/UART
Synchronous Serial
Communication Unit
(SSU)
1 (shared with I2C-bus)
I2C-bus 1 (shared with SSU)
A/D Converter 10-bit resolution × 5 channels, including sample and hold function, with sweep mode, temperature sensor included (measurement temperature range: -20 degrees C to 85 degrees C (N version)/-40 degrees C to 85 degrees C (D version))
Comparator B 1 circuit (comparator B1)
LCD Drive Control Circuit
  • Bias: 1/2, 1/3
  • Duty: static, 1/2, 1/3, 1/4
  • Common output: Max. 4 pins
  • Segment output: Max. 11 pins
Flash Memory
  • Programming and erasure voltage: VCC = 1.8 to 5.5V (data flash VCC = 1.8 to 5.5 V)
  • Programming and erasure endurance:
    10,000 times (data flash), 10,000 times (program ROM)
  • Program security: ROM code protect, ID code check
  • On-chip debug function
  • On-board flash rewrite function
Operating Frequency/
Supply Voltage
f(XIN) = 20 MHz (VCC = 2.7 to 5.5 V)
f(XIN) = 8 MHz (VCC = 1.8 to 5.5 V)
Current Consumption Typ. 4.7 mA (VCC = 5.0 V, f(XIN) = 20 MHz)
Typ. 2.3 mA (VCC = 3.0 V, f(XIN) = 10 MHz)
Typ. 1.7 µA (VCC = 3.0 V, wait mode (f(XCIN) = 32 kHz))
Typ. 0.5 µA (VCC = 3.0 V, stop mode)
Typ. 1.3 µA (VCC = 3.0 V, power-off 2 mode , timer RH enabled)
Typ. 0.01 µA (VCC = 3.0 V, power-off 0 mode, timer RH disabled)
Operating Ambient Temperature -20 to 85 degrees C (N version)
-40 to 85 degrees C (D version)(2)
Note:
  1. No pull-up resistor is provided in the pins P5_4 to P5_6.
  2. Specify the D version if D version functions are to be used.


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