PIC18F27J53T-I/SO Microchip Technology, PIC18F27J53T-I/SO Datasheet - Page 226

• Manufacturer Part Number: PIC18F27J53T-I/SO
• Description: 28-pin, USB, 128KB Flash, 4KB RAM, 12 MIPS, 12-bit ADC, NanoWatt XLP 28 SOIC .30
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F27J53T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2.15 V ~ 3.6 V
• Data Converters: A/D 10x10b/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3.8 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 8
• Operating Supply Voltage: 2.15 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

PIC18F47J53 FAMILY
15.3
Timer3/5 can be configured for 16-bit reads and writes
(see
(TxCON<1>) is set, the address for TMRxH is mapped to
a buffer register for the high byte of Timer3/5. A read from
TMRxL will load the contents of the high byte of Timer3/5
into the Timerx High Byte Buffer register. This provides
users with the ability to accurately read all 16 bits of
Timer3/5 without having to determine whether a read of
the high byte, followed by a read of the low byte, has
become invalid due to a rollover between reads.
A write to the high byte of Timer3/5 must also take place
through the TMRxH Buffer register. The Timer3/5 high
byte is updated with the contents of TMRxH when a write
occurs to TMRxL. This allows users to write all 16 bits to
both the high and low bytes of Timer3/5 at once.
The high byte of Timer3/5 is not directly readable or
writable in this mode. All reads and writes must take
place through the Timerx High Byte Buffer register.
Writes to TMRxH do not clear the Timer3/5 prescaler.
The prescaler is only cleared on writes to TMRxL.
15.4
The Timer1 internal oscillator may be used as the clock
source for Timer3/5. The Timer1 oscillator is enabled
by setting the T1OSCEN (T1CON<3>) bit. To use it as
the Timer3/5 clock source, the TMRxCS bits must also
be set. As previously noted, this also configures
Timer3/5 to increment on every rising edge of the
oscillator source.
The Timer1 oscillator is described in Section 13.0
“Timer1 Module”.
FIGURE 15-2:
DS39964B-page 226
Figure 15.3). When the RD16 control bit
TMRxGE
Timer3/5
Timer3/5 16-Bit Read/Write Mode
Using the Timer1 Oscillator as the
Timer3/5 Clock Source
TxGPOL
TxGVAL
TxG_IN
TxCKI
TIMER3/5 GATE COUNT ENABLE MODE
N
Preliminary
N + 1
15.5
Timer3/5 can be configured to count freely or the count
can be enabled and disabled using the Timer3/5 gate
circuitry. This is also referred to as the Timer3/5 gate
count enable.
The Timer3/5 gate can also be driven by multiple
selectable sources.
15.5.1
The Timerx Gate Enable mode is enabled by setting
the TMRxGE bit (TxGCON<7>). The polarity of the
Timerx Gate Enable mode is configured using the
TxGPOL bit (TxGCON<6>).
When Timerx Gate Enable mode is enabled, Timer3/5
will increment on the rising edge of the Timer3/5 clock
source. When Timerx Gate Enable mode is disabled,
no incrementing will occur and Timer3/5 will hold the
current count. See Figure 15-2 for timing details.
TABLE 15-1:
† The clock on which TMR3/5 is running. For more
TxCLK
information, see TxCLK in Figure 15-1.




(†)
Timer3/5 Gates
N + 2
TIMER3/5 GATE COUNT ENABLE
(TxGCON<6>)
TxGPOL
TIMER3/5 GATE ENABLE
SELECTIONS
0
0
1
1
 2010 Microchip Technology Inc.
N + 3
TxG
Pin
0
1
0
1
Counts
Holds Count
Holds Count
Counts
N + 4
Operation
Timerx