PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 262

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC17C7XX
FIGURE 20-21:
TABLE 20-16: USART ASYNCHRONOUS MODE START BIT DETECT REQUIREMENTS
FIGURE 20-22:
TABLE 20-17: USART ASYNCHRONOUS RECEIVE SAMPLING REQUIREMENTS
DS30289B-page 262
Note 1: Schmitt trigger will determine logic level.
Param
120A
121A
123A
No.
Param
125A
126A
(RX/DT pin)
No.
Baud CLK
x16 CLK
TdtL2ckH
TdtRF
TckH2bckL
Sym
RX
TdtL2ckH
TdtL2ckH
Sym
Q2, Q4 CLK
Time to ensure that the RX pin is sampled low
Data rise time and fall time
Time from RX pin sampled low to first rising edge
of x16 clock
USART ASYNCHRONOUS MODE START BIT DETECT
USART ASYNCHRONOUS RECEIVE SAMPLING WAVEFORM
(RX/DT pin)
x16 CLK
1
Setup time of RX pin to first data sampled
Hold time of RX pin from last data sam-
pled
120A
RX
2
3
Characteristic
4
Characteristic
121A
5
125A
123A
6
7
Samples
Receive
Transmit
8
START bit
9
126A
10
Min
Baud CLK for all but START bit
—
—
—
—
Min
T
T
CY
CY
11
START bit
12
Typ
—
—
—
—
Typ
—
—
13
(Note 1)
Max
T
T
14
40
Max
CY
CY
—
—
2000 Microchip Technology Inc.
15
Unit
Unit
ns
ns
ns
ns
s
ns
ns
16
s
1
Bit0
Conditions
Conditions
2
3