PIC16C745 Datasheet

IC型号：
PIC16C745
PDF描述：
8-Bit CMOS Microcontrollers with USB
文件大小：
4945.69KB
PDF页数：
165页
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PIC16C745/765

Steps to follow when setting up an Asynchronous

Transmission:

Initialize the SPBRG register for the appropriate

baud rate. If a high speed baud rate is desired,

set bit BRGH. (Section 11.1)

Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

If interrupts are desired, then set enable bit

TXIE.

If 9-bit transmission is desired, then set transmit

bit TX9.

Enable the transmission by setting bit TXEN,

which will also set bit TXIF.

If 9-bit transmission is selected, the ninth bit

should be loaded in bit TX9D.

Load data to the TXREG register (starts trans-

mission).

FIGURE 11-2: ASYNCHRONOUS MASTER TRANSMISSION

Write to TXREG

BRG output

(shift clock)

RC6/TX/CK (pin)

TXIF bit

(Transmit buffer

reg. empty flag)

Word 1

Start Bit

Bit 0

Bit 1

WORD 1

Bit 7/8

Stop Bit

TRMT bit

(Transmit shift

reg. empty flag)

WORD 1

Transmit Shift Reg

FIGURE 11-3: ASYNCHRONOUS MASTER TRANSMISSION (BACK TO BACK)

Write to TXREG

BRG output

(shift clock)

RC6/TX/CK (pin)

TXIF bit

(interrupt reg. flag)

Word 1

Word 2

Start Bit

Bit 0

Bit 1

WORD 1

Bit 7/8

Stop Bit

Start Bit

WORD 2

Bit 0

TRMT bit

(Transmit shift

reg. empty flag)

WORD 1

Transmit Shift Reg.

WORD 2

Transmit Shift Reg.

Note:

This timing diagram shows two consecutive transmissions.

TABLE 11-6:

Address

0Ch

18h

19h

8Ch

98h

99h

Name

PIR1

RCSTA

PIE1

TXSTA

REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION

it 7

PSPIF

(1)

SPEN

PSPIE

(1)

CSRC

Bit 6

ADIF

RX9

ADIE

TX9

Bit 5

RCIF

SREN

RCIE

TXEN

Bit 4

TXIF

CREN

TXIE

SYNC

Bit 3

Bit 2

Bit 1

TMR2IF

OERR

TMR2IE

TRMT

Bit 0

Value on:

POR,

BOR

Value on

all other

Resets

0000 0000

0000 -00x

0000 0000

0000 -010

0000 0000

USBIF CCP1IF

鈥?/div>

FERR

TMR1IF

0000 0000

RX9D

0000 -00x

0000 0000

TXREG USART Transmit Register

USBIE CCP1IE

鈥?/div>

BRGH

TX9D

TMR1IE

0000 0000

0000 -010

0000 0000

SPBRG Baud Rate Generator Register

Legend:

= unknown,

= unimplemented locations read as '0'. Shaded cells are not used for asynchronous transmission.

Note 1:

Bits PSPIE and PSPIF are reserved on the PIC16C745; always maintain these bits clear.

DS41124A-page 80

Advanced Information

漏

1999 Microchip Technology Inc.

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