- Components/
- Integrated Circuits (ICs)/
- Embedded - Microcontrollers/
PIC16C74-04/L
PIC16C74-04/L | |
|---|---|
| Manufacturer Part Number | PIC16C74-04/L |
| Description | MICRO CTRL 4K 4MHZ OTP 44PLCC |
| Manufacturer | Microchip Technology |
| Series | PIC® 16C |
| PIC16C74-04/L datasheets |
|
Availability: By request
International delivery:
Warranty: 60 days
×
- We provide standard 60-days warranty for all parts. If warranty differs we always mention it beforehand. In case of return we cover shipping costs.
- If you still have any questions - please contact us
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Specifications of PIC16C74-04/L | |||
|---|---|---|---|
| Core Processor | PIC | Core Size | 8-Bit |
| Speed | 4MHz | Connectivity | I²C, SPI, UART/USART |
| Peripherals | POR, PWM, WDT | Number Of I /o | 33 |
| Program Memory Size | 7KB (4K x 14) | Program Memory Type | OTP |
| Ram Size | 192 x 8 | Voltage - Supply (vcc/vdd) | 4 V ~ 6 V |
| Data Converters | A/D 8x8b | Oscillator Type | External |
| Operating Temperature | 0°C ~ 70°C | Package / Case | 44-PLCC |
| For Use With | DVA16XL441 - ADAPTER DEVICE ICE 44PLCC | Lead Free Status / RoHS Status | Request inventory verification / Request inventory verification |
| Eeprom Size | - | ||
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PrevNext
12.1
USART Baud Rate Generator (BRG)
Applicable Devices
72 73 73A 74 74A 76 77
The BRG supports both the Asynchronous and Syn-
chronous modes of the USART. It is a dedicated 8-bit
baud rate generator. The SPBRG register controls the
period of a free running 8-bit timer. In asynchronous
mode bit BRGH (TXSTA<2>) also controls the baud
rate. In synchronous mode bit BRGH is ignored.
Table 12-1 shows the formula for computation of the
baud rate for different USART modes which only apply
in master mode (internal clock).
Given the desired baud rate and Fosc, the nearest inte-
ger value for the SPBRG register can be calculated
using the formula in Table 12-1. From this, the error in
baud rate can be determined.
Example 12-1 shows the calculation of the baud rate
error for the following conditions:
F
= 16 MHz
OSC
Desired Baud Rate = 9600
BRGH = 0
SYNC = 0
TABLE 12-1:
BAUD RATE FORMULA
SYNC
BRGH = 0 (Low Speed)
(Asynchronous) Baud Rate = F
0
1
(Synchronous) Baud Rate = F
X = value in SPBRG (0 to 255)
TABLE 12-2:
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
Address
Name
Bit 7
Bit 6
98h
TXSTA
CSRC
TX9
18h
RCSTA
SPEN
RX9
99h
SPBRG
Baud Rate Generator Register
Legend: x = unknown, - = unimplemented read as '0'. Shaded cells are not used by the BRG.
1997 Microchip Technology Inc.
EXAMPLE 12-1: CALCULATING BAUD
Desired Baud rate = Fosc / (64 (X + 1))
9600 =
X
=
Calculated Baud Rate=16000000 / (64 (25 + 1))
=
9615
Error
=
(Calculated Baud Rate - Desired Baud Rate)
=
(9615 - 9600) / 9600
=
0.16%
It may be advantageous to use the high baud rate
(BRGH = 1) even for slower baud clocks. This is
because the F
OSC
baud rate error in some cases.
Note:
For the PIC16C73/73A/74/74A, the asyn-
chronous high speed mode (BRGH = 1)
may experience a high rate of receive
errors. It is recommended that BRGH = 0.
If you desire a higher baud rate than
BRGH = 0 can support, refer to the device
errata for additional information, or use the
PIC16C76/77.
Writing a new value to the SPBRG register, causes the
BRG timer to be reset (or cleared), this ensures the
BRG does not wait for a timer overflow before output-
ting the new baud rate.
/(64(X+1))
OSC
/(4(X+1))
OSC
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
TXEN SYNC
—
BRGH TRMT TX9D
SREN CREN
—
FERR OERR RX9D
PIC16C7X
RATE ERROR
16000000 /(64 (X + 1))
25.042 = 25
Desired Baud Rate
/(16(X + 1)) equation can reduce the
BRGH = 1 (High Speed)
Baud Rate= F
/(16(X+1))
OSC
NA
Value on:
Value on all
Bit 0
POR,
other resets
BOR
0000 -010
0000 -010
0000 -00x
0000 -00x
0000 0000
0000 0000
DS30390E-page 101
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