PIC16C71 datasheet(110/337 Pages) MICROCHIP

110 / 337 page

PIC16C6X

DS30234D-page 110

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)

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

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

baud CLK

x16 CLK

Start bit

Bit0

Samples

Baud CLK for all but start bit

(RC7/RX/DT pin)

RC7/RX/DT pin

baud clk

x4 clk

Q2, Q4 clk

Start Bit

bit0

bit1

First falling edge after RX pin goes low

Second rising edge

Samples

2341

RC7/RX/DT pin

baud clk

x4 clk

Q2, Q4 clk

Start Bit

bit0

First falling edge after RX pin goes low

Second rising edge

Samples

Baud clk for all but start bit

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