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- Integrated Circuits (ICs)/
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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
11.3.1
SPI MODE FOR PIC16C76/77
The SPI mode allows 8-bits of data to be synchro-
nously transmitted and received simultaneously. To
accomplish communication, typically three pins are
used:
• Serial Data Out (SDO) RC5/SDO
• Serial Data In (SDI) RC4/SDI/SDA
• Serial Clock (SCK) RC3/SCK/SCL
Additionally a fourth pin may be used when in a slave
mode of operation:
• Slave Select (SS) RA5/SS/AN4
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits in the SSPCON register (SSPCON<5:0>)
and SSPSTAT<7:6>. These control bits allow the fol-
lowing to be specified:
• Master Mode (SCK is the clock output)
• Slave Mode (SCK is the clock input)
• Clock Polarity (Idle state of SCK)
• Clock edge (output data on rising/falling edge of
SCK)
• Clock Rate (Master mode only)
• Slave Select Mode (Slave mode only)
The SSP consists of a transmit/receive Shift Register
(SSPSR) and a buffer register (SSPBUF). The SSPSR
shifts the data in and out of the device, MSb first. The
SSPBUF holds the data that was written to the SSPSR
until the received data is ready. Once the 8-bits of data
have been received, that byte is moved to the SSPBUF
register. Then
the
buffer
full
detect
(SSPSTAT<0>) and interrupt flag bit SSPIF (PIR1<3>)
are set. This double buffering of the received data
(SSPBUF) allows the next byte to start reception before
reading the data that was just received. Any write to the
SSPBUF register during transmission/reception of data
will be ignored, and the write collision detect bit WCOL
(SSPCON<7>) will be set. User software must clear the
WCOL bit so that it can be determined if the following
write(s) to the SSPBUF register completed success-
fully. When the application software is expecting to
receive valid data, the SSPBUF should be read before
the next byte of data to transfer is written to the
SSPBUF. Buffer full bit BF (SSPSTAT<0>) indicates
when SSPBUF has been loaded with the received data
(transmission is complete). When the SSPBUF is read,
bit BF is cleared. This data may be irrelevant if the SPI
is only a transmitter. Generally the SSP Interrupt is
used to determine when the transmission/reception
has completed. The SSPBUF must be read and/or writ-
ten. If the interrupt method is not going to be used, then
software polling can be done to ensure that a write col-
lision does not occur. Example 11-2 shows the loading
of the SSPBUF (SSPSR) for data transmission. The
shaded instruction is only required if the received data
is meaningful.
1997 Microchip Technology Inc.
Applicable Devices
72 73 73A 74 74A 76 77
EXAMPLE 11-2: LOADING THE SSPBUF
BCF
STATUS, RP1
BSF
STATUS, RP0
LOOP BTFSS SSPSTAT, BF
GOTO
LOOP
BCF
STATUS, RP0
MOVF
SSPBUF, W
MOVWF RXDATA
MOVF
TXDATA, W
MOVWF SSPBUF
The block diagram of the SSP module, when in SPI
mode (Figure 11-9), shows that the SSPSR is not
directly readable or writable, and can only be accessed
from addressing the SSPBUF register. Additionally, the
SSP status register (SSPSTAT) indicates the various
status conditions.
FIGURE 11-9: SSP BLOCK DIAGRAM
(SPI MODE)(PIC16C76/77)
Read
bit
BF
RC4/SDI/SDA
bit0
RC5/SDO
SS Control
Enable
RA5/SS/AN4
Edge
Select
SSPM3:SSPM0
Select
RC3/SCK/
SCL
TRISC<3>
PIC16C7X
(SSPSR) REGISTER
(PIC16C76/77)
;Specify Bank 1
;
;Has data been
;received
;(transmit
;complete)?
;No
;Specify Bank 0
;W reg = contents
; of SSPBUF
;Save in user RAM
;W reg = contents
; of TXDATA
;New data to xmit
Internal
data bus
Write
SSPBUF reg
SSPSR reg
shift
clock
2
Clock Select
TMR2 output
4
2
Edge
T
Prescaler
CY
4, 16, 64
DS30390E-page 85
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