C501 datasheet(21/48 Pages) INFINEON

21 / 48 page

Semiconductor Group

1997-04-01

C501

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 baudrates can be calculated using the

formulas given in table 7.

Table 6

USART Operating Modes

Mode

SCON

Baudrate

Description

SM0

SM1

OSC/12

Serial data enters and exits through R

×D.

×D outputs the shift clock. 8-bit are

transmitted/received (LSB first)

Timer 1/2 overflow rate

8-bit UART

10 bits are transmitted (through T

×D) or

received (R

×D)

OSC/32 or fOSC/64

9-bit UART

11 bits are transmitted (T

×D) or

received (R

×D)

Timer 1/2 overflow rate

9-bit UART

Like mode 2 except the variable baud rate

Table 7

Formulas for Calculating Baudrates

Baud Rate

derived from

Interface Mode

Baudrate

Oscillator

OSC/12

(2SMOD

× f

OSC) / 64

Timer 1 (16-bit timer)

(8-bit timer with

8-bit autoreload)

1,3

(2SMOD

× timer 1 overflow rate) /32

(2SMOD

× f

OSC) / (32 × 12 × (256-TH1))

Timer 2

1,3

OSC / (32 × (65536-(RC2H, RC2L))

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