PIC16LCR66T-04E/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LCR66T-04E/SO

8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C6X

12.1.1 SAMPLING

The data on the RC7/RX/DT pin is sampled three times

by a majority detect circuit to determine if a high or a

low level is present at the RX pin. If bit BRGH

(TXSTA<2>) is clear (i.e., at the low baud rates), the

sampling is done on the seventh, eighth and ninth fall-

ing edges of a x16 clock (Figure 12-3). If bit BRGH is

set (i.e., at the high baud rates), the sampling is done

on the 3 clock edges preceding the second rising edge

after the first falling edge of a x4 clock (Figure 12-4 and

Figure 12-5).

FIGURE 12-3: RX PIN SAMPLING SCHEME (BRGH = 0) PIC16C63/R63/65/65A/R65)

RX

(RC7/RX/DT pin)

baud CLK

x16 CLK

Start bit

Bit0

Baud CLK for all but start bit

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3

Samples

FIGURE 12-4: RX PIN SAMPLING SCHEME (BRGH = 1) (PIC16C63/R63/65/65A/R65)

RC7/RX/DT pin

Start Bit

bit0

bit1

baud clk

x4 clk

Q2, Q4 clk

First falling edge after RX pin goes low

Second rising edge

1 2 34 12 3 4 1 2

Samples

Samples

Samples

FIGURE 12-5: RX PIN SAMPLING SCHEME (BRGH = 1) (PIC16C63/R63/65/65A/R65)

RC7/RX/DT pin

Start Bit

bit0

baud clk

x4 clk

Q2, Q4 clk

Baud clk for all but start bit

First falling edge after RX pin goes low

Second rising edge

1

2

3

4

Samples

DS30234D-page 110

© 1997 Microchip Technology Inc.

Share Link: