PIC16LF874A-I/L Microchip Technology, PIC16LF874A-I/L Datasheet - Page 79

• Manufacturer Part Number: PIC16LF874A-I/L
• Description: IC MCU FLASH 4KX14 EE A/D 44PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16LF874A-I/L

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 10MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Controller Family/series: PIC16LF
• No. Of I/o's: 33
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC16LF874A-I/LR; PIC16LF874A-I/LR; PIC16LF874AI/L

9.3.6
In Slave mode, the data is transmitted and received as
the external clock pulses appear on SCK. When the
last bit is latched, the SSPIF interrupt flag bit is set.
While in Slave mode, the external clock is supplied by
the external clock source on the SCK pin. This external
clock must meet the minimum high and low times as
specified in the electrical specifications.
While in Sleep mode, the slave can transmit/receive
data. When a byte is received, the device will wake-up
from Sleep.
9.3.7
The SS pin allows a Synchronous Slave mode. The
SPI must be in Slave mode with SS pin control enabled
(SSPCON<3:0> = 04h). The pin must not be driven low
for the SS pin to function as an input. The data latch
must be high. When the SS pin is low, transmission and
reception are enabled and the SDO pin is driven. When
FIGURE 9-4:
 2003 Microchip Technology Inc.
SS
SCK
(CKP = 0
CKE = 0)
SCK
(CKP = 1
CKE = 0)
Write to
SSPBUF
SDO
SDI
(SMP = 0)
Input
Sample
(SMP = 0)
SSPIF
Interrupt
Flag
SSPSR to
SSPBUF
SLAVE MODE
SLAVE SELECT
SYNCHRONIZATION
SLAVE SYNCHRONIZATION WAVEFORM
bit 7
bit 7
bit 6
the SS pin goes high, the SDO pin is no longer driven
even if in the middle of a transmitted byte and becomes
a floating output. External pull-up/pull-down resistors
may be desirable, depending on the application.
When the SPI module resets, the bit counter is forced
to ‘0’. This can be done by either forcing the SS pin to
a high level or clearing the SSPEN bit.
To emulate two-wire communication, the SDO pin can
be connected to the SDI pin. When the SPI needs to
operate as a receiver, the SDO pin can be configured
as an input. This disables transmissions from the SDO.
The SDI can always be left as an input (SDI function)
since it cannot create a bus conflict.
Note 1: When the SPI is in Slave mode with SS pin
2: If the SPI is used in Slave Mode with CKE
control enabled (SSPCON<3:0> = 0100),
the SPI module will reset if the SS pin is set
to V
set, then the SS pin control must be
enabled.
bit 7
bit 7
DD
.
PIC16F87XA
Next Q4 Cycle
after Q2
DS39582B-page 77
bit 0
bit 0