PIC16F946T-I/PT Microchip Technology, PIC16F946T-I/PT Datasheet - Page 111

• Manufacturer Part Number: PIC16F946T-I/PT
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F946T-I/PT

• 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: 53
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

9.3
The LCD driver module can be configured into four
multiplex types:
• Static (only COM0 used)
• 1/2 multiplex (COM0 and COM1 are used)
• 1/3 multiplex (COM0, COM1 and COM2 are used)
• 1/4 multiplex (all COM0, COM1, COM2 and COM3
The LMUX<1:0> setting decides the function of RB5,
RA2 and RD0 pins (see Table 9-1 for details).
If the pin is a digital I/O, the corresponding TRIS bit
controls the data direction. If the pin is a COM drive,
then the TRIS setting of that pin is overridden.
TABLE 9-1:
9.4
The LCDSEn registers are used to select the pin
function for each segment pin. The selection allows
each pin to operate as either an LCD segment driver or
as one of the pin’s alternate functions. To configure the
pin as a segment pin, the corresponding bits in the
LCDSEn registers must be set to ‘1’. See Figures 9-4
and 9-5 for more details.
If the pin is a digital I/O, the corresponding TRIS bit
controls the data direction. Any bit set in the LCDSEn
registers overrides any bit settings in the corresponding
TRIS register.
9.5
The LCDDATAx registers contain bits which define the
state of each pixel. Each bit defines one unique pixel.
Register 9-4 shows the correlation of each bit in the
LCDDATAx registers to the respective common and
segment signals.
Any LCD pixel location not being used for display can
be used as general purpose RAM.
9.6
The rate at which the COM and SEG outputs change is
called the LCD frame frequency.
© 2005 Microchip Technology Inc.
are used)
Note:
LMUX
Note:
<1:0>
00
01
10
11
LCD Multiplex Types
Segment Enables
Pixel Control
LCD Frame Frequency
COM3 Driver COM2 Driver COM1 Driver
On a Power-on Reset, the LMUX<1:0>
bits are ‘11’.
On a Power-on Reset, these pins are
configured as digital I/O.
Digital I/O
Digital I/O
Digital I/O
RD0
RD0, RA2, RB5 FUNCTION
COM2 Driver COM1 Driver
Digital I/O
Digital I/O
RA2
COM1 Driver
Digital I/O
RB5
Preliminary
TABLE 9-2:
TABLE 9-3:
Multiplex
Note:
LP<3:0>
Static
1/2
1/3
1/4
2
3
4
5
6
7
Clock source is F
LFINTOSC/32.
Clock source/(4 x 1 x (LP<3:0> + 1))
Clock source/(2 x 2 x (LP<3:0> + 1))
Clock source/(1 x 3 x (LP<3:0> + 1))
Clock source/(1 x 4 x (LP<3:0> + 1))
Static
FRAME FREQUENCY
FORMULAS
APPROXIMATE FRAME
FREQUENCY (IN Hz) USING
F
32.768 kHz OR INTOSC
85
64
51
43
37
32
OSC
Frame Frequency =
@ 8 MHz, TIMER1 @
PIC16F946
OSC
1/2
85
64
51
43
37
32
/8192, T1OSC/32 or
DS41265A-page 109
114
1/3
85
68
57
49
43
1/4
85
64
51
43
37
32