PIC16F1947-I/PT Microchip Technology Inc., PIC16F1947-I/PT Datasheet - Page 342
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PIC16F1947-I/PT
Manufacturer Part Number
PIC16F1947-I/PT
Description
64 TQFP 10x10x1mm TRAY28KB Flash, 1KB RAM, 256B EEPROM, LCD, 1.8-5.5V
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16LF1946-IPT.pdf
(448 pages)
Specifications of PIC16F1947-I/PT
A/d Inputs
17-Channel, 10-Bit
Comparators
3
Cpu Speed
8 MIPS
Eeprom Memory
256 Bytes
Input Output
54
Interface
CAN/I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
64-pin TQFP
Programmable Memory
28K Bytes
Ram Size
1K Bytes
Speed
32 MHz
Timers
4-8-bit, 1-16-bit
Voltage, Range
1.8-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC16F/LF1946/47
27.2
The LCD module has 3 possible clock sources:
• F
• T1OSC
• LFINTOSC
The first clock source is the system clock divided by
256 (F
about 1 kHz output when the system clock is 8 MHz.
The divider is not programmable. Instead, the LCD
prescaler bits LP<3:0> of the LCDPS register are used
to set the LCD frame clock rate.
The second clock source is the T1OSC. This also gives
about 1 kHz when a 32.768 kHz crystal is used with the
Timer1 oscillator. To use the Timer1 oscillator as a
clock source, the T1OSCEN bit of the T1CON register
should be set.
The third clock source is the 31 kHz LFINTOSC, which
provides approximately 1 kHz output.
The second and third clock sources may be used to
continue running the LCD while the processor is in
Sleep.
FIGURE 27-2:
DS41414B-page 342
OSC
Nominal = 31 kHz
T1OSC 32 kHz
F
OSC
Crystal Osc.
OSC
/256
LFINTOSC
LCD Clock Source Selection
/256). This divider ratio is chosen to provide
÷256
LCD CLOCK GENERATION
CS<1:0>
÷2
÷4
LMUX<1:0>
Preliminary
Static
1/2
1/3,
1/4
4-bit Prog
Using bits CS<1:0> of the LCDCON register can select
any of these clock sources.
27.2.1
A 4-bit counter is available as a prescaler for the LCD
clock. The prescaler is not directly readable or writable;
its value is set by the LP<3:0> bits of the LCDPS register,
which determine the prescaler assignment and prescale
ratio.
The prescale values are selectable from 1:1 through
1:16.
Prescaler
LP<3:0>
Power Control
LCD PRESCALER
To Ladder
Counter
÷ 32
2010 Microchip Technology Inc.
Segment
Clock
Ring Counter
÷1, 2, 3, 4
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