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Table 1. Specifications for R8C/L38M Group

Item Function Specification
CPU Central
processing
unit
R8C CPU core
  • Number of fundamental instructions: 89
  • Minimum instruction execution time:
    50ns (f(XIN) = 20 MHz, VCC = 2.7 to 5.5 V)
    200ns (f(XIN) = 5 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: 68, selectable pull-up resistor
  • 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 RE)
Interrupts
  • Number of interrupt vectors: 69
  • External interrupt: 16 (INT × 8, 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
DTC (Data Transfer
Controller)
  • 1 channel
  • Activation sources: 38
  • Transfer modes: 2 (normal mode, repeat mode)
Timer Timer RA
8 bits × 1 (with 8-bit prescaler)
Timer mode (period timer), pulse output mode (output level inverted every period), event counter mode, pulse width measurement mode, pulse period measurement mode
Timer RB
8 bits × 1 (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 RD
16 bits × 2 (with 4 capture/compare registers)
Timer mode (input capture function, output compare function), PWM mode (output: 6 pins), reset synchronous PWM mode (three-phase waveform output: 6 pins, sawtooth wave modulation), complementary PWM mode (three-phase waveform output: 6 pins, triangular wave modulation), PWM3 mode (PWM output with fixed period: 2 pins)
Timer RE
8 bits × 1
Real-time clock mode (counting of seconds, minutes, hours, days of week), output compare mode
Timer RG
16 bits × 1
Phase-counting mode, timer mode (output compare function, input capture function), PWM mode (output: 1 pin)
Serial
Interface
UART0, UART1 Clock synchronous serial I/O/UART × 2 channels
UART2 Clock synchronous serial I/O/UART, I2C mode (Simple I2C), multiprocessor communication function
Synchronous Serial
Communication Unit
(SSU)
1 (shared with I2C-bus)
I2C-bus 1 (shared with SSU)
LIN Module Hardware LIN: 1 channel (timer RA, UART0 used)
A/D Converter 10-bit resolution × 16 channels, including sample and hold function, with sweep mode
D/A Converter 8-bit resolution × 2 circuits
Comparator B 2 circuits
LCD Drive Control Circuit
  • Bias: 1/2, 1/3, 1/4
  • Duty: static, 1/2, 1/3, 1/4, 1/8
  • Common output: Max. 8 pins
  • Segment output: Max. 48 pins(1)
  • Voltage multiplier and dedicated regulator integrated
Flash Memory
  • Programming and erasure voltage: VCC=2.7 to 5.5 V
  • Programming and erasure endurance:
    10,000 times (data flash), 1,000 times (program ROM)
  • Program security: ROM code protect, ID code check
  • On-chip debug functions
  • On-board flash rewrite function
  • Background operation (BGO) function
Operating Frequency/
Supply Voltage
f(XIN) = 20 MHz (VCC = 2.7 to 5.5 V)
f(XIN) = 5 MHz (VCC = 1.8 to 5.5 V)
Current Consumption Typ. 7 mA (VCC = 5.0 V, f(XIN) = 20 MHz)
Typ. 3.6 mA (VCC = 3.0 V, f(XIN) = 10 MHz)
Typ. 3.5 µA (VCC = 3.0 V, wait mode (f(XCIN) = 32 kHz))
Typ. 2 µA (VCC = 3.0 V, stop mode)
Typ. 1.4 µA (VCC = 3.0 V, power-off mode, timer RE enabled)
Typ. 0.02 µA (VCC = 3.0 V, power-off mode, timer RE disabled)
Operating Ambient Temperature -20 to 85 degrees C (N version)
-40 to 85 degrees C (D version)(2)
Notes:
  1. This applies when four pins are selected for common output.
  2. Specify the D version if D version functions are to be used.

 

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