PIC16LF1847-E/MV Microchip Technology, PIC16LF1847-E/MV Datasheet - Page 262
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PIC16LF1847-E/MV
Manufacturer Part Number
PIC16LF1847-E/MV
Description
14 KB Flash, 1K Bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core, Nan
Manufacturer
Microchip Technology
Series
PIC® XLP™ mTouch™ 16Fr
Datasheet
1.PIC16F1847-EP.pdf
(408 pages)
Specifications of PIC16LF1847-E/MV
Processor Series
PIC16LF
Core
RISC
Data Bus Width
10 bit
Program Memory Type
Flash
Program Memory Size
8 KB
Data Ram Size
1024 B
Interface Type
SPI, I2C
Maximum Clock Frequency
32 KHZ
Number Of Programmable I/os
15
Number Of Timers
3
Operating Supply Voltage
3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
UQFN-28
Operating Temperature Range
- 40 C to + 125 C
Processor To Be Evaluated
PIC16F1847
Supply Current (max)
34 uA
Core Processor
PIC
Core Size
8-Bit
Speed
32MHz
Connectivity
I²C, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
15
Eeprom Size
256 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Lead Free Status / Rohs Status
Details
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PIC16(L)F1847
25.5.6 CLOCK STRETCHING
Clock stretching occurs when a device on the bus
holds the SCLx line low effectively pausing communi-
cation. The slave may stretch the clock to allow more
time to handle data or prepare a response for the mas-
ter device. A master device is not concerned with
stretching as anytime it is active on the bus and not
transferring data it is stretching. Any stretching done
by a slave is invisible to the master software and han-
dled by the hardware that generates SCLx.
The CKP bit of the SSPxCON1 register is used to con-
trol stretching in software. Any time the CKP bit is
cleared, the module will wait for the SCLx line to go
low and then hold it. Setting CKP will release SCLx
and allow more communication.
25.5.6.1 Normal Clock Stretching
Following an ACK if the R/W bit of SSPxSTAT is set, a
read request, the slave hardware will clear CKP. This
allows the slave time to update SSPxBUF with data to
transfer to the master. If the SEN bit of SSPxCON2 is
set, the slave hardware will always stretch the clock
after the ACK sequence. Once the slave is ready; CKP
is set by software and communication resumes.
FIGURE 25-23:
DS41453B-page 262
SSPxCON1
WR
SDAx
SCLx
CKP
Note 1: The BF bit has no effect on if the clock will
2: Previous versions of the module did not
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
be stretched or not. This is different than
previous versions of the module that
would not stretch the clock, clear CKP, if
SSPxBUF was read before the 9th falling
edge of SCLx.
stretch the clock for a transmission if
SSPxBUF was loaded before the 9th fall-
ing edge of SCLx. It is now always cleared
for read requests.
CLOCK SYNCHRONIZATION TIMING
DX
Master device
asserts clock
Preliminary
25.5.6.2 10-bit Addressing Mode
In 10-bit Addressing mode, when the UA bit is set, the
clock is always stretched. This is the only time the
SCLx is stretched without CKP being cleared. SCLx is
released immediately after a write to SSPxADD.
25.5.6.3 Byte NACKing
When AHEN bit of SSPxCON3 is set; CKP is cleared
by hardware after the 8th falling edge of SCLx for a
received matching address byte. When DHEN bit of
SSPxCON3 is set; CKP is cleared after the 8th falling
edge of SCLx for received data.
Stretching after the 8th falling edge of SCLx allows the
slave to look at the received address or data and
decide if it wants to ACK the received data.
25.5.7 CLOCK SYNCHRONIZATION AND
Any time the CKP bit is cleared, the module will wait
for the SCLx line to go low and then hold it. However,
clearing the CKP bit will not assert the SCLx output
low until the SCLx output is already sampled low.
Therefore, the CKP bit will not assert the SCLx line
until an external I
asserted the SCLx line. The SCLx output will remain
low until the CKP bit is set and all other devices on the
I
to the CKP bit will not violate the minimum high time
requirement for SCLx (see
2
Master device
releases clock
C bus have released SCLx. This ensures that a write
Note: Previous versions of the module did not
THE CKP BIT
stretch the clock if the second address byte
did not match.
2
C master device has already
2011 Microchip Technology Inc.
Figure
25-22).
DX ‚
–
1
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