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

Timer 1

Overflow

Baud

Rate

f OSC

Generator

(SRELH

SRELL)

÷6

ADCON0.7

SCON.7

(BD)

SCON.6

(SM0/

0

1

Mode 1

SM1)

Mode 3

÷2

Mode 2

Mode 0

Only one mode

can be selected

Note: The switch configuration shows the reset state.

PCON.7

(SMOD)

0

Baud

1

Rate

Clock

MCS02733

Figure 14

Block Diagram of Baud Rate Generation for the Serial Interface

Table 8 below lists the values/formulas for the baud rate calculation of the serial interface with its

dependencies of the control bits BD and SMOD.

Table 8

Serial Interface - Baud Rate Dependencies

Serial Interface

Operating Modes

Mode 0 (Shift Register)

Mode 1 (8-bit UART)

Mode 3 (9-bit UART)

Mode 2 (9-bit UART)

Active Control Bits Baud Rate Calculation

BD

SMOD

–

–

fOSC / 6

0

X

Controlled by timer 1 overflow :

(2SMOD × timer 1 overflow rate) / 32

1

X

Controlled by baud rate generator

(2SMOD × fOSC) /

(32 × baud rate generator overflow rate)

–

0

1

fOSC / 32

fOSC / 16

Data Sheet

34

12.00

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