PIC16F1937-I/P Microchip Technology, PIC16F1937-I/P Datasheet - Page 253

• Manufacturer Part Number: PIC16F1937-I/P
• Description: IC PIC MCU FLASH 512KX14 40-PDIP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-I/P

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 40-DIP (0.600", 15.24mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: EUSART/MI2C/SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• A/d Bit Size: 10 bit
• A/d Channels Available: 14
• Height: 4.95 mm
• Length: 53.21 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Width: 14.73 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

21.4.3
As an LCD segment is electrically only a capacitor, cur-
rent is drawn only during the interval where the voltage
is switching. To minimize total device current, the LCD
internal reference ladder can be operated in a different
power mode for the transition portion of the duration.
This
(Register 21-7).
FIGURE 21-4:
FIGURE 21-5:
© 2008 Microchip Technology Inc.
Segment Data
Segment Data
Power Mode
Power Mode
is
LRLAT[2:0]
LRLAT[2:0]
32kHz_clk
32kHz_clk
cnt[4:0]
cnt[4:0]
lcd_clk
lcd_clk
controlled
AUTOMATIC POWER MODE
SWITCHING
LCD INTERNAL REFERENCE LADDER POWER MODE SWITCHING DIAGRAM –
TYPE A
LCD INTERNAL REFERENCE LADDER POWER MODE SWITCHING DIAGRAM –
TYPE B
‘H00
‘H00
by
Power Mode A
Power Mode A
LRLAT<2:0>
LRLAT<2:0>
the
‘H01
‘H01
LCDRL
‘H02
‘H02
‘H03
‘H03
Register
Preliminary
Single Segment Time
Single Segment Time
‘H04
‘H04
‘H05
‘H05
The LCDLAD register allows switching between two
power modes, designated ‘A’ and ‘B’. ‘A’ Power mode
is active for a programmable time, beginning at the
time win the LCD segments transition. ‘B’ Power mode
is the remaining time before the segments or com-
mons change again. The LRLAT<2:0> bits select how
long, if any, that the ‘A’ Power mode is active. Refer
to Figure 21-4.
To implement this, the 5-bit prescaler used to divide
the 32 kHz clock down to the LCD controller’s 1 kHz
base rate is used to select the power mode.
‘H3
‘H3
Power Mode B
Power Mode B
PIC16F193X/LF193X
‘H06
‘H06
‘H07
‘H07
‘H0E
‘H1E
‘H0F
‘H1F
DS41364A-page 251
‘H00
‘H00
Mode A
Mode A
‘H01
‘H01