PIC16LC77-04I/PQ Microchip Technology, PIC16LC77-04I/PQ Datasheet - Page 86
![IC MCU OTP 8KX14 A/D PWM 44-MQFP](/photos/6/59/65984/150-44-pqfp_sml.jpg)
PIC16LC77-04I/PQ
Manufacturer Part Number
PIC16LC77-04I/PQ
Description
IC MCU OTP 8KX14 A/D PWM 44-MQFP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16LC77-04I/PQ
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
14KB (8K x 14)
Program Memory Type
OTP
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 6 V
Data Converters
A/D 8x8b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-MQFP, 44-PQFP
Core
PIC
Processor Series
PIC16LC
Data Bus Width
8 bit
Maximum Clock Frequency
20 MHz
Data Ram Size
368 B
Data Rom Size
368 B
On-chip Adc
8
Number Of Programmable I/os
33
Number Of Timers
3 bit
Operating Supply Voltage
2.5 V to 6 V
Mounting Style
SMD/SMT
Height
2 mm
Interface Type
I2C, SPI, USART
Length
10 mm
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Supply Voltage (max)
6 V
Supply Voltage (min)
2.5 V
Width
10 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LC77-04I/PQ
Manufacturer:
Microchip Technology
Quantity:
10 000
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PIC16C7X
To enable the serial port, SSP Enable bit, SSPEN
(SSPCON<5>) must be set. To reset or reconfigure SPI
mode, clear bit SSPEN, re-initialize the SSPCON reg-
ister, and then set bit SSPEN. This configures the SDI,
SDO, SCK, and SS pins as serial port pins. For the pins
to behave as the serial port function, they must have
their data direction bits (in the TRISC register) appro-
priately programmed. That is:
• SDI must have TRISC<4> set
• SDO must have TRISC<5> cleared
• SCK (Master mode) must have TRISC<3>
• SCK (Slave mode) must have TRISC<3> set
• SS must have TRISA<5> set
Any serial port function that is not desired may be over-
ridden by programming the corresponding data direc-
tion (TRIS) register to the opposite value. An example
would be in master mode where you are only sending
data (to a display driver), then both SDI and SS could
be used as general purpose outputs by clearing their
corresponding TRIS register bits.
Figure 11-10 shows a typical connection between two
microcontrollers. The master controller (Processor 1)
initiates the data transfer by sending the SCK signal.
Data is shifted out of both shift registers on their pro-
grammed clock edge, and latched on the opposite edge
of the clock. Both processors should be programmed to
same Clock Polarity (CKP), then both controllers would
send and receive data at the same time. Whether the
data is meaningful (or dummy data) depends on the
application firmware. This leads to three scenarios for
data transmission:
• Master sends data — Slave sends dummy data
• Master sends data — Slave sends data
• Master sends dummy data — Slave sends data
FIGURE 11-10: SPI MASTER/SLAVE CONNECTION (PIC16C76/77)
DS30390E-page 86
cleared
SPI Master SSPM3:SSPM0 = 00xxb
MSb
PROCESSOR 1
Serial Input Buffer
Shift Register
(SSPBUF)
(SSPSR)
LSb
SDO
SCK
SDI
72 73 73A 74 74A 76 77
Applicable Devices
Serial Clock
The master can initiate the data transfer at any time
because it controls the SCK. The master determines
when the slave (Processor 2) is to broadcast data by
the firmware protocol.
In master mode the data is transmitted/received as
soon as the SSPBUF register is written to. If the SPI is
only going to receive, the SCK output could be disabled
(programmed as an input). The SSPSR register will
continue to shift in the signal present on the SDI pin at
the programmed clock rate. As each byte is received, it
will be loaded into the SSPBUF register as if a normal
received byte (interrupts and status bits appropriately
set). This could be useful in receiver applications as a
“line activity monitor” mode.
In slave mode, the data is transmitted and received as
the external clock pulses appear on SCK. When the
last bit is latched the interrupt flag bit SSPIF (PIR1<3>)
is set.
The clock polarity is selected by appropriately program-
ming bit CKP (SSPCON<4>). This then would give
waveforms for SPI communication as shown in
Figure 11-11, Figure 11-12, and Figure 11-13 where
the MSB is transmitted first. In master mode, the SPI
clock rate (bit rate) is user programmable to be one of
the following:
• F
• F
• F
• Timer2 output/2
This allows a maximum bit clock frequency (at 20 MHz)
of 5 MHz. When in slave mode the external clock must
meet the minimum high and low times.
In sleep mode, the slave can transmit and receive data
and wake the device from sleep.
OSC
OSC
OSC
SDO
SCK
SDI
/4 (or T
/16 (or 4 • T
/64 (or 16 • T
SPI Slave SSPM3:SSPM0 = 010xb
MSb
CY
)
Serial Input Buffer
CY
Shift Register
CY
PROCESSOR 2
(SSPBUF)
)
(SSPSR)
)
1997 Microchip Technology Inc.
LSb
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