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SERIAL I/O

7733 Group User’s Manual

8–2

The serial I/O consists of 3 channels: UART0, UART1 and UART2. They each have a dedicated timer for

generating a transfer clock and can operate independently.

8.1 Overview

UARTi (i = 0 to 2) has the following two operating modes: clock synchronous serial I/O and clock asynchronous

serial I/O (UART) modes. Except for a few functions in the clock synchronous serial I/O mode, UART0,

UART1 and UART2 have the same functions.

q Clock synchronous serial I/O mode

Transmitter and receiver use the same clock as a transfer clock. Transfer data has a length of 8 bits.

q Clock asynchronous serial I/O (UART) mode

Transfer rate and transfer data format can arbitrarily be set. The transfer data length can be selected

from the following three types: 7 bits, 8 bits, and 9 bits.

Figure 8.1.1 shows the transfer data formats in each operating mode. Table 8.1.1 shows the differences

between UART0, UART1 and UART2.

8.1 Overview

Fig. 8.1.1 Transfer data formats in each operating mode

Clock synchronous serial I/O mode

UART mode

Transfer data length : 7 bits

Transfer data length : 8 bits

Transfer data length : 9 bits

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