Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 133)

133

AT8xC5122/23

4202E–SCR–06/06

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 79 the selection is done using RBCK and TBCK bits in BDRCON

Figure 80 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 79. Baud Rate Source Selection (Modes 1 and 3)

Figure 80. 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 Po

/ 16/ 16

Baud_Rate

⋅ 32 ⋅ (256 -BRL)

SMOD1

⋅ F

CK_SI

BRL = 256

(1-SPD

⋅ 32 ⋅ Baud_Rate

SMOD1

⋅ F

CK_SI

Baud_Rate

6 ⋅ 32 ⋅ (256 -TH1)

SMOD1

⋅ F

CK_T1

TH1 = 256

192 ⋅ Baud_Rate

SMOD1

⋅ F

CK_T1

a. IBRG Formula b. T1 Formula

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 212 213

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