PIC18F87K90-E/PT Microchip Technology, PIC18F87K90-E/PT Datasheet - Page 194

• Manufacturer Part Number: PIC18F87K90-E/PT
• Description: 128kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TR
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F87K90-E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87K90 FAMILY
13.8.2
The Timer1 gate source can be selected from one of
four sources. Source selection is controlled by the
T1GSSx bits, T1GCON<1:0> (see
TABLE 13-4:
The polarity for each available source is also selectable,
controlled by the T1GPOL bit (T1GCON<6>).
13.8.2.1
The T1G pin is one source for Timer1 gate control. It
can be used to supply an external source to the Timer1
gate circuitry.
DS39957D-page 194
T1GSS<1:0>
00
01
10
11
TIMER1 GATE SOURCE
SELECTION
T1G Pin Gate Operation
Timer1 Gate Pin
TMR2 to Match PR2
(TMR2 increments to match PR2)
Comparator 1 Output
(Comparator logic high output)
Comparator 2 Output
(Comparator logic high output)
TIMER1 GATE SOURCES
Timer1 Gate Source
Table
13-4).
13.8.2.2
The TMR2 register will increment until it matches the
value in the PR2 register. On the very next increment
cycle, TMR2 will be reset to 00h. When this Reset
occurs, a low-to-high pulse will automatically be gener-
ated and internally supplied to the Timer1 gate circuitry.
The pulse will remain high for one instruction cycle and
will return back to a low state until the next match.
Depending on T1GPOL, Timer1 increments differently
when TMR2 matches PR2. When T1GPOL = 1, Timer1
increments for a single instruction cycle following a
TMR2 match with PR2. When T1GPOL = 0, Timer1
increments continuously, except for the cycle following
the match, when the gate signal goes from low-to-high.
13.8.2.3
The output of Comparator 1 can be internally supplied
to the Timer1 gate circuitry. After setting up
Comparator 1 with the CM1CON register, Timer1 will
increment depending on the transition of the
CMP1OUT (CMSTAT<5>) bit.
13.8.2.4
The output of Comparator 2 can be internally supplied
to the Timer1 gate circuitry. After setting up
Comparator 2 with the CM2CON register, Timer1 will
increment depending on the transition of the
CMP2OUT (CMSTAT<6>) bit.
Timer2 Match Gate Operation
Comparator 1 Output Gate Operation
Comparator 2 Output Gate Operation
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