C504 Просмотр технического описания (PDF) - Infineon Technologies

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C504

8-Bit Single-Chip Microcontroller

Infineon Technologies 

C504

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 6. The possible baud rates can be

calculated using the formulas given in Table 6.

Table 6

USART Operating Modes

Mode

SCON Baud Rate

Description

SM0 SM1

0

0

0

fOSC/12

Serial data enters and exits through

R×D. T×D outputs the shift clock. 8-bit

are transmitted/received (LSB first)

1

0

1

Timer 1/2 overflow rate 8-bit UART

10 bits are transmitted (through T×D)

or received (R×D)

2

1

0

fOSC/32 or fOSC/64

9-bit UART

11 bits are transmitted (T×D) or

received (R×D)

3

1

1

Timer 1/2 overflow rate 9-bit UART

Like mode 2 except the variable baud

rate

Timer 2

Overflow

Timer 1

Overflow

Phase 2

CLK

(=f OSC /2)

SM0 / SM1

Mode 1, 3

Mode 2

PCON.7

(SMOD)

2

0

1

T2CON

(RCLK, TCLK)

Baud

0

Rate

Clock

1

MCB02414

Figure 13 Baud Rate Generation for the Serial Interface

Data Sheet

26

2000-05

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