AT89C5122D-RDRUM datasheet(131/208 Pages) ATMEL

131 / 208 page

131

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Baud Rate Selection

(Modes 1 and 3)

In modes 1 and 3, the Baud Rate is derived either from the Timer 1 or the Internal Baud

Rate Generator and allows different baud rate in reception and transmission.

As shown in Figure 78 the selection is done using RBCK and TBCK bits in BDRCON

Figure 79 gives the baud rate calculation formulas for each baud rate source while

Table 76 details Internal Baud Rate Generator configuration for different peripheral

clock frequencies and giving baud rates closer to the standard baud rates.

Figure 78.

Baud Rate Source Selection (Modes 1 and 3)

Figure 79.

Baud Rate Formulas (Modes 1 and 3)

RBCK

BDRCON.2

CLOCK

To serial

IBRG

CLOCK

reception Port

TBCK

BDRCON.3

CLOCK

To serial

IBRG

CLOCK

transmission Port

/ 16

Baud_Rate =

(1-SPD)

⋅ 32 ⋅ (256 -BRL)

SMOD1 ⋅ F

CK_SI

BRL = 256 -

6(1-SPD)

⋅ 32 ⋅ Baud_Rate

2SMOD1

⋅ F

CK_SI

Baud_Rate =

192

⋅ (256 -TH1)

2SMOD1

⋅ F

CK_T1

TH1 = 256 -

192

⋅ Baud_Rate

SMOD1 ⋅ F

CK_T1

a. IBRG Formula

b. T1 Formula

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