SAKC505A-2R 查看數據表（PDF） - Infineon Technologies

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SAKC505A-2R

8-Bit Single-Chip Microcontroller

Infineon Technologies 

C505/C505C/C505A/C505CA

Serial Interface (USART)

The serial port is full duplex and can operate in four modes (one synchronous mode, three

asynchronous modes) as illustrated in Table 7.

Table 7

USART Operating Modes

Mode

0

1

2

3

SCON

SM0

SM1

0

0

0

1

1

0

1

1

Description

Shift register mode, fixed baud rate

Serial data enters and exits through R×D; T×D outputs the shift

clock; 8-bit are transmitted/received (LSB first)

8-bit UART, variable baud rate

10 bits are transmitted (through T×D) or received (at R×D)

9-bit UART, fixed baud rate

11 bits are transmitted (through T×D) or received (at R×D)

9-bit UART, variable baud rate

Like mode 2

For clarification some terms regarding the difference between "baud rate clock" and "baud rate"

should be mentioned. In the asynchronous modes the serial interfaces require a clock rate which is

16 times the baud rate for internal synchronization. Therefore, the baud rate generators/timers have

to provide a "baud rate clock" (output signal in Figure 14 to the serial interface which - there divided

by 16 - results in the actual "baud rate". Further, the abbrevation fOSC refers to the oscillator

frequency (crystal or external clock operation).

The variable baud rates for modes 1 and 3 of the serial interface can be derived either from timer 1

or from a decdicated baud rate generator (see Figure 14).

Data Sheet

33

12.00

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