PIC16C74B-20/P Microchip Technology Inc., PIC16C74B-20/P Datasheet - Page 55
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PIC16C74B-20/P
Manufacturer Part Number
PIC16C74B-20/P
Description
40 PIN, 7 KB OTP, 192 RAM, 33 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16C74B-20P.pdf
(184 pages)
Specifications of PIC16C74B-20/P
A/d Inputs
8-Channel, 8-Bit
Cpu Speed
5 MIPS
Eeprom Memory
0 Bytes
Input Output
33
Interface
I2C/SPI/USART
Memory Type
OTP
Number Of Bits
8
Package Type
40-pin PDIP
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
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10.0
10.1
The Synchronous Serial Port (SSP) module is a serial
interface useful for communicating with other periph-
eral or microcontroller devices. These peripheral
devices may be Serial EEPROMs, shift registers, dis-
play drivers, A/D converters, etc. The SSP module can
operate in one of two modes:
• Serial Peripheral Interface (SPI)
• Inter-Integrated Circuit (I
An overview of I
tion on the SSP module can be found in the PICmicro™
Mid-Range
(DS33023).
Refer to Application Note AN578, “Use of the SSP
Module in the I
10.2
This section contains register definitions and opera-
tional characteristics of the SPI module.
SPI mode allows 8 bits of data to be synchronously
transmitted and received simultaneously. To accom-
plish 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
• Clock Rate (Master mode only)
• Slave Select mode (Slave mode only)
SCK)
2000 Microchip Technology Inc.
SYNCHRONOUS SERIAL PORT
(SSP) MODULE
SSP Module Overview
SPI Mode
MCU
2
C Multi-Master Environment.”
2
C operations and additional informa-
Family
2
C)
Reference
Manual
PIC16C63A/65B/73B/74B
FIGURE 10-1:
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> cleared
• SCK (Slave mode) must have TRISC<3> set
• SS must have TRISA<5> set
• ADCON1 must configure RA5 as a digital I/O pin.
.
RC4/SDI/SDA
RA5/SS/AN4
Note 1: When the SPI is in Slave mode with SS
RC3/SCK/
RC5/SDO
SCL
2: If the SPI is used in Slave mode with
pin control enabled (SSPCON<3:0> =
0100), the SPI module will reset if the SS
pin is set to V
CKE = '1', then the SS pin control must be
enabled.
Read
SS Control
Select
TRISC<3>
Edge
SSP BLOCK DIAGRAM
(SPI MODE)
Enable
SSPM3:SSPM0
bit0
Select
Edge
SSPBUF reg
DD
SSPSR reg
.
Clock Select
4
2
DS30605C-page 55
Prescaler
TMR2 Output
4, 16, 64
Write
Clock
Shift
Data Bus
Internal
2
T
CY