PIC16F913-I/SP Microchip Technology, PIC16F913-I/SP Datasheet - Page 108

• Manufacturer Part Number: PIC16F913-I/SP
• Description: IC PIC MCU FLASH 4KX14 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F913-I/SP

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 24
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SSP/I2C/AUSART/SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• 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, PG164120, ICE2000, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5-ch x 10-bit
• Package: 28SPDIP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

oscillator/32 (LFINTOSC), which provides approximately
PIC16F91X
9.1
The LCD driver module has 3 possible clock sources:
• F
• T13CKI-Clock/32
• INTOSC/32
The first clock source is the system clock divided by
8192 (F
provide about 1 kHz output when the system clock is
8 MHz. The divider is not programmable. Instead, the
LCD prescaler bits, LCDPS<3:0>, are used to set the
LCD frame clock rate.
The second clock source is the Timer1 oscillator/32.
This also gives about 1 kHz when a 32.768 kHz crystal
is used with the Timer1 oscillator. To use the Timer1
oscillator
(T1CON<3>) bit should be set.
The third clock source is a 31.25 kHz internal RC
1 kHz output.
The second and third clock sources may be used to
continue running the LCD while the processor is in
Sleep.
Using the bits, CS<1:0> (LCDCON<3:2>), any of these
clock sources can be selected.
FIGURE 9-2:
DS41250B-page 106
Note 1:
V
V
V
OSC
DD
DD
DD
*
*
*
/8192
OSC
*
LCD Clock Source Selection
as
These values are provided for design guidance only and should be optimized for the application by the
designer.
Internal connection.
/8192). This divider ratio is chosen to
LCD Bias 3
a
10 k *
10 k *
clock
LCD BIAS RESISTOR LADDER CONNECTION DIAGRAM
source,
LCD Bias 2
10 k *
the
T1OSCEN
LCD Bias 1
10 k *
10 k *
Preliminary
V
V
V
V
LCD
LCD
LCD
LCD
3
2
1
0
9.1.1
A 16-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 (LCDPS<3:0>), which
determine the prescaler assignment and prescale ratio.
The prescale values from 1:1 through 1:16.
9.2
The LCD driver module can be configured into three
bias types:
• Static Bias (2 voltage levels: V
• 1/2 Bias (3 voltage levels: V
• 1/3 Bias (4 voltage levels: V
This module uses an external resistor ladder to
generate the LCD bias voltages.
The external resistor ladder should be connected to the
Bias 1 pin, Bias 2 pin, Bias 3 pin and V
pin should also be connected to V
Figure 9-2 shows the proper way to connect the
resistor ladder to the Bias pins.
(1)
and V
Note:
To
LCD
Driver
V
V
SS
SS
Connections for External R-ladder
DD
LCD Bias Types
)
LCD PRESCALER
VLCD pins used to supply LCD bias
voltage are enabled on power-up (POR)
and must be disabled by the user by
clearing LCDCON<4>, the VLCDEN bit,
(see Register 9-1).
V
V
V
V
Static Bias
LCD
LCD
LCD
LCD
1/2 Bias
1/3 Bias
0
1
2
3
Static
Bias
 2004 Microchip Technology Inc.
V
V
—
—
DD
SS
SS
SS
SS
, 1/2 V
, 1/3 V
1/2 Bias 1/3 Bias
1/2 V
1/2 V
DD
V
V
and V
DD
SS
.
DD
DD
DD
DD
SS
DD
, 2/3 V
. The Bias 3
and V
1/3 V
2/3 V
)
V
V
DD
SS
DD
DD
DD
DD
)