SAFC504 datasheet(30/71 Pages) INFINEON

30 / 71 page

C504

Data Sheet

2000-05

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.

Figure 13

Baud Rate Generation for the Serial Interface

Table 6

USART Operating Modes

Mode

SCON

Baud Rate

Description

SM0

SM1

OSC/12

Serial data enters and exits through

×D. T×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

SM0 / SM1

PCON.7

(SMOD)

(RCLK, TCLK)

T2CON

Timer 1

Overflow

Phase 2

CLK

/2)

f OSC

Timer 2

Overflow

Mode 1, 3

Mode 2

MCB02414

Baud

Rate

Clock

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