PIC16F1938-I/ML Microchip Technology, PIC16F1938-I/ML Datasheet - Page 253

• Manufacturer Part Number: PIC16F1938-I/ML
• Description: IC MCU 8BIT FLASH 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1938-I/ML

• Core Size: 8-Bit
• Program Memory Size: 28KB (16K x 14)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC16F
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 1024Byte
• Cpu Speed: 32MHz
• Package: 28QFN EP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 32 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/USART
• On-chip Adc: 11-chx10-bit
• Number Of Timers: 5
• Lead Free Status / RoHS Status: 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:
© 2009 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
DS41364C-page 253
‘H00
‘H00
Mode A
Mode A
‘H01
‘H01