OverviewThe touch key microcontrollers (MCUs) of the R8C/3JT Group are devices incorporating an electrostatic capacitive touch detector into the R8C/3x Series.
By integrating on a single chip a touch sensor IC for touch detection and a microcontroller for controlling the system based on the signals received, the R8C/3JT Group specifically meets the following five customer needs.
- More compact system size, and furthermore compact QFN package (5 mm x 5mm, 0.5 mm thick) for thinner devices
- System control via I/O ports
- Touch key connection via touch detection input pins (22-input)
- Reduced power consumption
- Improved noise tolerance
|・||CPU core: R8C 16-bit CPU core|
|・||Minimum instruction execution time: |
50nsec (f(Xin)=20 MHz)
|・||Supply voltage: |
2.7 to 5.5 V/Max. 20 MHz , 1.8 to 5.5 V/Max. 5 MHz
|・||ROM/RAM: 16 KB/1.5 KB, 24 KB/2 KB, 32 KB/2.5 KB|
(RAM: 0.5 KB for touch detection)
|・||Data flash: 1 KB x 4 blocks (Touch setting values can be stored.), with background operation (BGO) function*1|
|・||DTC (Data transfer controller): 1 ch|
|・||Clock generation circuits: 3 circuits|
|-||XIN-XOUT main clock (oscillation stop detection circuit included)|
|-||High-speed on-chip oscillator (40 MHz Typ.）|
|-||Low-speed on-chip oscillator (125 kHz Typ.)|
|・||Voltage detection circuit (LVD): |
3 circuits (detection levels selectable)
|・||Power-on reset (POR) circuit|
|・||Watchdog timer: 1 ch (supports hardware reset)|
|・||Multifunction timer: 3 ch|
|-||8-bit timer 2 ch (Timer RA, Timer RB)|
|-||16-bit timer 1 ch (Timer RC)|
|・||Serial interface: 2 ch|
|-||Clock synchronous/UART0, UART2 (Simple I2C/SSU*2)|
|-||Hardware LIN (UART & Timer RA)|
|・||A/D converter: 10-bit x 12 ch|
|・||Touch detector (SCU)*3: 22-input (shared with I/O ports)|
(Reduces power consumption by allowing touch detection in wait mode.)
|・||I/O ports: Input/Output: 31, Input only: 1|
(Large-current drive capacity is provided. Variable input threshold values: 3 values)
40-pin HXQFN (5 mm x 5 mm x 0.5 mm, 0.4 mm pitch)
*1: A function to read the program ROM area during data flash programming or block erase operation.
*2: Synchronous serial communication unit
*3: Sensor control unit
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