PIC16C73A-04/SP Microchip Technology Inc., PIC16C73A-04/SP Datasheet - Page 104

• Manufacturer Part Number: PIC16C73A-04/SP
• Description: 28 PIN, 7 KB OTP, 192 RAM, 22 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16C73A-04/SP

• A/d Inputs: 5-Channel, 8-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 22
• Interface: I2C/SPI/USART
• Memory Type: OTP
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 7K Bytes
• Ram Size: 192 Bytes
• Speed: 4 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2.5-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16C7X
12.1.1
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
FIGURE 12-3: RX PIN SAMPLING SCHEME. BRGH = 0 (PIC16C73/73A/74/74A)
FIGURE 12-4: RX PIN SAMPLING SCHEME, BRGH = 1 (PIC16C73/73A/74/74A)
FIGURE 12-5: RX PIN SAMPLING SCHEME, BRGH = 1 (PIC16C73/73A/74/74A)
DS30390E-page 104
Q2, Q4 clk
(RC7/RX/DT pin)
baud clk
RX pin
x4 clk
SAMPLING
baud CLK
x16 CLK
RX
Q2, Q4 clk
RX pin
baud clk
1
x4 clk
2
First falling edge after RX pin goes low
3
1
4
5
1
Start Bit
Samples
First falling edge after RX pin goes low
6
2
Samples
7
Samples
Second rising edge
3
Start Bit
8
2
4
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).
9
Second rising edge
Start bit
1
Samples
10
Baud clk for all but start bit
bit0
2
11
Baud CLK for all but start bit
12
3
3
13
4
14
1
Samples
1997 Microchip Technology Inc.
bit1
15
2
16
1
4
2
Bit0
3
bit0