Atmel AT85DVK-07 Especificaciones descargar pdf (Pagina 214)

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AT85C51SND3Bx

7632A–MP3–03/06

Figure 106. SIO Block Diagram

Character Format The character consists of five fields: start, data, parity, stop and guard fields.

Figure 107 shows a character example with 8 data bits, 1 parity bit, 2 stop bits and 2

guard bits.

Figure 107. Character Format Example

Start Field The start field is fixed and composed of 1 bit transmitted or received at low level.

Data Field The data field is composed of 7 or 8 bits by programming DLEN bit in SCON according

Table 236. The least significant bit is always first transmitted.

Table 236. Data Bit Number Selection

Parity Field The parity field is optional and enabled by PBEN bit in SCON. This field is composed of

bit and its mode is programmable by PMOD1:0 bits in SCON according to Table 237.

Table 237. Parity Mode Selection

Stop Field The stop field is composed of 1 or 2 bits transmitted or received at high level by pro-

gramming STOP bit in SCON according to Table 238.

RXD

CTS

DFC

CPU

RTS

TXD

SIO Interrupt

Request

SIO

CLOCK

Baud Rate

Generator

Receiver

Transmitter

Interrupt

Controller

Bus

D3D0 D1

Data Stop 1Parity Stop 2

D2 D4 D5 D6 D7 P

2 Guard BitsStart

Char N Inter-Char Char N+1

DLEN Description

0 7-bit Data Length.

1 8-bit Data Length.

PMOD1 PMOD0 Description

0 0 MARK: high Level

0 1 SPACE: Low Level

1 0 EVEN: High Level if the number of bits at high level in the data field is even.

1 1 ODD: Low Level if the number of bits at high level in the data field is odd.

1 2 ... 209 210 211 212 213 214 215 216 217 218 219 ... 262 263

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