PIC16LC72A-04/SO Microchip Technology, PIC16LC72A-04/SO Datasheet - Page 39

• Manufacturer Part Number: PIC16LC72A-04/SO
• Description: IC MCU OTP 2KX14 A/D PWM 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16LC72A-04/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

8.0
8.1
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
For more information on SSP operation (including an
I
erence Manual, (DS33023). Also, refer to Application
Note AN578, “Use of the SSP Module in the I
Master Environment.”
8.2
This section contains register definitions and opera-
tional characteristics of the SPI module.
Additional information on SPI operation may be found
in the PICmicro™ Mid-Range Reference Manual,
(DS33023).
8.2.1
A block diagram of the SSP Module in SPI Mode is
shown in Figure 8-1.
The SPI mode allows 8-bits of data to be synchro-
nously transmitted and received simultaneously. To
accomplish communication, 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 Operation (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 operation only)
• Slave Select Mode (Slave mode only)
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-
2
C Overview), refer to the PICmicro™ Mid-Range Ref-
SCK)
1999 Microchip Technology Inc.
SYNCHRONOUS SERIAL PORT
(SSP) MODULE
SSP Module Overview
SPI Mode
OPERATION OF SSP MODULE IN SPI
MODE
2
C)
2
C Multi-
Preliminary
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 operation) must have TRISC<3>
• SCK (Slave mode) must have TRISC<3> set
• SS must have TRISA<5> set (if used)
FIGURE 8-1:
RC4/SDI/SDA
RC5/SDO
RA5/SS/AN4
RC3/SCK/
SCL
cleared
Note:
Note:
When the SPI is in Slave Mode with SS pin
control enabled, (SSPCON<3:0> = 0100)
the SPI module will reset if the SS pin is set
to V
If the SPI is used in Slave Mode with
CKE = '1', then the SS pin control must be
enabled.
PIC16C62B/72A
DD
Read
SS Control
Select
TRISC<3>
.
SSP BLOCK DIAGRAM
(SPI MODE)
Edge
Enable
SSPM3:SSPM0
bit0
Select
Edge
SSPBUF reg
SSPSR reg
Clock Select
4
2
DS35008B-page 39
Write
Prescaler
4, 16, 64
Clock
Shift
TMR2 output
Data Bus
Internal
2
T
CY