PIC16F914-I/PT Microchip Technology, PIC16F914-I/PT Datasheet - Page 123

• Manufacturer Part Number: PIC16F914-I/PT
• Description: IC PIC MCU FLASH 4KX14 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F914-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 44-TQFP, 44-VQFP
• 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: 35
• Eeprom Size: 256 x 8
• Ram Size: 256 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
• 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: 35
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164120, DM163029
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

9.8
The LCD timing generation provides an interrupt that
defines the LCD frame timing. This interrupt can be
used to coordinate the writing of the pixel data with the
start of a new frame. Writing pixel data at the frame
boundary allows a visually crisp transition of the image.
This interrupt can also be used to synchronize external
events to the LCD.
A new frame is defined to begin at the leading edge of
the COM0 common signal. The interrupt will be set
immediately after the LCD controller completes
accessing all pixel data required for a frame. This will
occur at a fixed interval before the frame boundary
(T
will begin to access data for the next frame within the
interval from the interrupt to when the controller begins
to access data after the interrupt (T
must be written within T
controller will begin to access the data for the next
frame.
FIGURE 9-16:
 2004 Microchip Technology Inc.
FINT
), as shown in Figure 9-16. The LCD controller
COM0
COM1
COM2
COM3
T
T
FWR
FINT
LCD Interrupts
= T
= (T
(T
FRAME
FWR
FWR
/2 – (2 T
/2 – (1 T
Frame
Boundary
/2*(LMUX<1:0> + 1) + T
(EXAMPLE – TYPE-B, NON-STATIC)
WAVEFORMS AND INTERRUPT TIMING IN QUARTER-DUTY CYCLE DRIVE
FWR
CY
CY
, as this is when the LCD
+ 40 ns))
+ 40 ns))
FWR
minimum = 1.5(T
maximum = 1.5(T
). New data
CY
/2
Preliminary
2 Frames
FRAME
FRAME
Frame
Boundary
/4) – (2 T
/4) – (1 T
When the LCD driver is running with Type-B waveforms
and the LMUX<1:0> bits are not equal to ‘00’, there are
some additional issues that must be addressed. Since
the DC voltage on the pixel takes two frames to maintain
zero volts, the pixel data must not change between
subsequent frames. If the pixel data were allowed to
change, the waveform for the odd frames would not
necessarily be the complement of the waveform
generated in the even frames and a DC component
would be introduced into the panel. Therefore, when
using Type-B waveforms, the user must synchronize the
LCD pixel updates to occur within a subframe after the
frame interrupt.
To correctly sequence writing while in Type-B, the
interrupt will only occur on complete phase intervals. If the
user attempts to write when the write is disabled, the
WERR (LCDCON<5>) bit is set.
Note:
CY
CY
LCD
Interrupt
Occurs
+ 40 ns)
+ 40 ns)
The interrupt is not generated when the
Type-A waveform is selected and when the
Type-B with no multiplex (static) is
selected.
T
FWR
T
FINT
PIC16F91X
Controller Accesses
Next Frame Data
Frame
Boundary
DS41250B-page 121
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0