Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 112)

112

AT8xC5132

4173A–8051–08/02

Notes: 1. These frequencies are achieved in X1 mode, F

PER

= F

OSC

÷ 2.

2. These frequencies are achieved in X2 mode, F

PER

= F

OSC

Baud Rate Selection (Mode 2) In mode 2, the baud rate can only be programmed to two fixed values: 1/16 or 1/32 of

the peripheral clock frequency.

As shown in Figure 89 the selection is done using SMOD1 bit in PCON register.

Figure 90 gives the baud rate calculation formula depending on the selection.

Figure 89. Baud Rate Generator Selection (mode 2)

Figure 90. Baud Rate Formula (Mode 2)

Table 106. Baud Rate Generator Configuration

Baud Rate

PER

= 6 MHz

(1)

PER

= 8 MHz

(1)

PER

= 10 MHz

(1)

SPD SMOD1 BRL Error% SPD SMOD1 BRL Error% SPD SMOD1 BRL Error%

115200 - -----------

57600 - - - - 1 1 247 3.55 1 1 245 1.36

38400 1 1 246 2.34 1 1 243 0.16 1 1 240 1.73

19200 1 1 236 2.34 1 1 230 0.16 1 1 223 1.36

9600 1 1 217 0.16 1 1 204 0.16 1 1 191 0.16

4800 1 1 178 0.16 1 1 152 0.16 1 1 126 0.16

Baud Rate

PER

= 12 MHz

(2)

PER

= 16 MHz

(2)

PER

= 20 MHz

(2)

SPD SMOD1 BRL Error% SPD SMOD1 BRL Error% SPD SMOD1 BRL Error%

115200 - - - - 1 1 247 3.55 1 1 245 1.36

57600 1 1 243 0.16 1 1 239 2.12 1 1 234 1.36

38400 1 1 236 2.34 1 1 230 0.16 1 1 223 1.36

19200 1 1 217 0.16 1 1 204 0.16 1 1 191 0.16

9600 1 1 178 0.16 1 1 152 0.16 1 1 126 0.16

4800 1 1 100 0.16 1 1 48 0.16 1 0 126 0.16

SMOD1

PCON.7

PER

CLOCK

÷ 2

÷ 16

To Serial Port

Baud_Rate =

SMOD1

⋅ F

PER

1 2 ... 107 108 109 110 111 112 113 114 115 116 117 ... 161 162

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