NEC MuPD78F0132H User Manual page 278

8-bit single-chip microcontrollers, 78k0/ke1plus

Table of Contents

(2) Communication operation

(a) Format and waveform example of normal transmit/receive data

Figures 13-6 and 13-7 show the format and waveform example of the normal transmit/receive data.

One data frame consists of the following bits.

• Start bit ... 1 bit

• Character bits ... 7 or 8 bits (LSB first)

• Parity bit ... Even parity, odd parity, 0 parity, or no parity

• Stop bit ... 1 or 2 bits

The character bit length, parity, and stop bit length in one data frame are specified by asynchronous serial

interface operation mode register 0 (ASIM0).

Figure 13-7. Example of Normal UART Transmit/Receive Data Waveform

1. Data length: 8 bits, Parity: Even parity, Stop bit: 1 bit, Communication data: 55H

2. Data length: 7 bits, Parity: Odd parity, Stop bit: 2 bits, Communication data: 36H

3. Data length: 8 bits, Parity: None, Stop bit: 1 bit, Communication data: 87H

CHAPTER 13 SERIAL INTERFACE UART0

Figure 13-6. Format of Normal UART Transmit/Receive Data

1 data frame

Character bits

1 data frame

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