LC87F7932B

No.A1841-3/29

High-speed Clock Counter

(1) Can count clocks with a maximum clock rate of 8MHz (at a main clock of 4MHz).

(2) Can generate output real-time.

Serial-interface

• SIO 0: 8 bit synchronous serial interface

(1) Synchronous 8-bit serial I/O (2- or 3-wire system, clock rates of (4/3) to (512/3) tCYC)

(2) Continuous data transmission/reception (Variable length data transmission in bit units from 1 to 256 bits,

clock rates of (4/3) to (512/3) tCYC)

(3) Bi-phase modulation (Manchester, Bi-phase-Space) data transmission

(4) LSB first / MSB first is selectable

(5) SPI_function: serial interface that can release HOLD/X’tal HOLD mode after receiving 1-byte (8-bit clock).

• SIO 1: 8 bit asynchronous / synchronous serial interface

Mode 0: Synchronous 8 bit serial IO (2-wire or 3-wire, transmit clock 2–512 tCYC)

Mode 1: Asynchronous serial IO (half duplex, 8 data bits, 1 stop bit, baud rate 8–2048 tCYC)

Mode 2: Bus mode 1 (start bit, 8 data bits, transmit clock 2–512 tCYC)

Mode 3: Bus mode 2 (start detection, 8 data bits, stop detection)

UART

• Full duplex

• 7/8/9 bit data bits selectable

• 1 stop bit (2-bit in continuous data transmission)

• Built-in baudrate generator

• Operating mode: Programmable transfer mode, fixed-rate transfer mode

• Transmission data conversion: Normal (NRZ), Manchester encoding

AD converter: 12 bits/8 bits

× 7 channels

• 12 bits/8 bits AD converter resolution selectable

Remote Control Receiver Circuit (Connected to P73 / INT3 / T0IN terminal)

• Noise rejection function (Noise rejection filter’s time constant can be selected from 1 / 32 / 128 tCYC)

Watchdog Timer

• Watchdog timer can produce interrupt or system reset.

• Watchdog timer has two types.

(1) Use an external RC circuit

(2) Use the microcontroller’s basetimer

• Watchdog timer that used basetimer can select only one period (1 / 2 / 4 / 8 s) by the user option.

Buzzer Output

• The buzzer output can transmitted from P17 by using basetimer.

Real Time Clock (RTC)

(1) Used with a basetimer, it can be used as a century + year + month + day + hour + minute + second counter.

(2) Calendar counts up to December 31, 2799 with automatic leap-year calculation.

(3) Gregorian calendar capable of keeping GMT (Greenwich Mean Time).

Internal Reset Function

• Power-On-Reset (POR) function

− POR resets the system when the power supply voltage is applied.