PIC18F67J11T-I/PT Microchip Technology, PIC18F67J11T-I/PT Datasheet - Page 287

• Manufacturer Part Number: PIC18F67J11T-I/PT
• Description: IC PIC MCU FLASH 64KX16 64TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F67J11T-I/PT

• Core Size: 8-Bit
• Program Memory Size: 128KB (64K x 16)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 52
• Program Memory Type: FLASH
• Ram Size: 3930 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 11x10b
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Controller Family/series: PIC18
• No. Of I/o's: 52
• Ram Memory Size: 3930Byte
• Cpu Speed: 48MHz
• No. Of Timers: 5
• No. Of Pwm: RoHS Compliant
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3904 B
• Interface Type: EUSART, I2C, MSSP, SPI
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 68
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DV164136, DM183022, DM183032
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 15 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162091 - HEADER MPLAB ICD2 18F87J11 64/80MA180020 - MODULE PLUG-IN HPC EXPL 18F87J11AC164327 - MODULE SKT FOR 64TQFP
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18F67J11T-I/PTTR

23.4
The Two-Speed Start-up feature helps to minimize the
latency period, from oscillator start-up to code execu-
tion, by allowing the microcontroller to use the INTRC
oscillator as a clock source until the primary clock
source is available. It is enabled by setting the IESO
configuration bit.
Two-Speed Start-up should be enabled only if the
primary
(Crystal-based) modes. Since the EC and ECPLL
modes do not require an OST start-up delay,
Two-Speed Start-up should be disabled.
When enabled, Resets and wake-ups from Sleep mode
cause the device to configure itself to run from the inter-
nal oscillator block as the clock source, following the
time-out of the Power-up Timer after a Power-on Reset
is enabled. This allows almost immediate code
execution while the primary oscillator starts and the
OST is running. Once the OST times out, the device
automatically switches to PRI_RUN mode.
FIGURE 23-3:
© 2006 Microchip Technology Inc.
Two-Speed Start-up
oscillator
Note 1:
CPU Clock
PLL Clock
Peripheral
Program
Counter
INTRC
Output
OSC1
Clock
T
OST
mode
TIMING TRANSITION FOR TWO-SPEED START-UP (INTRC TO HSPLL)
Wake from Interrupt Event
= 1024 T
PC
is
OSC
; T
Q1
HS
PLL
T
OST (1)
= 2 ms (approx). These intervals are not shown to scale.
or
Q2
PC + 2
HSPLL
OSTS bit Set
T
PLL
Preliminary
Q3
(1)
Q4
In all other power-managed modes, Two-Speed
Start-up is not used. The device will be clocked by the
currently selected clock source until the primary clock
source becomes available. The setting of the IESO bit
is ignored.
23.4.1
While using the INTRC oscillator in Two-Speed
Start-up, the device still obeys the normal command
sequences for entering power-managed modes,
including
Section 3.1.4 “Multiple Sleep Commands”). In prac-
tice, this means that user code can change the
SCS1:SCS0 bit settings or issue SLEEP instructions
before the OST times out. This would allow an applica-
tion to briefly wake-up, perform routine “housekeeping”
tasks and return to Sleep before the device starts to
operate from the primary oscillator.
User code can also check if the primary clock source is
currently providing the device clocking by checking the
status of the OSTS bit (OSCCON<3>). If the bit is set,
the primary oscillator is providing the clock. Otherwise,
the internal oscillator block is providing the clock during
wake-up from Reset or Sleep mode.
Q1
1
Transition
2
Clock
n-1 n
SPECIAL CONSIDERATIONS FOR
USING TWO-SPEED START-UP
serial
PC + 4
PIC18F87J10
SLEEP
Q2
Q3 Q4
instructions
Q1
PC + 6
DS39663D-page 285
Q2
Q3
(refer
to