PIC18F67J60T-I/PT Microchip Technology, PIC18F67J60T-I/PT Datasheet - Page 360
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PIC18F67J60T-I/PT
Manufacturer Part Number
PIC18F67J60T-I/PT
Description
128KB Flash, 12KB RAM, 10BASE-T Ethernet 64 TQFP 10x10x1mm T/R
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC18F66J65-IPT.pdf
(8 pages)
2.PIC18F66J65-IPT.pdf
(480 pages)
3.PIC18F66J65-IPT.pdf
(4 pages)
4.PIC18F66J65-IPT.pdf
(10 pages)
Specifications of PIC18F67J60T-I/PT
Core Processor
PIC
Core Size
8-Bit
Speed
41.667MHz
Connectivity
Ethernet, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
39
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Ram Size
3808 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 3.6 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TFQFP
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3808 B
Interface Type
Display Driver, Ethernet, EUSART, I2C, MSSP, SPI
Maximum Clock Frequency
41.667 MHz
Number Of Programmable I/os
39
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, DM183033
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 11 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DM183033 - BOARD DEMO INTERNET RADIOAC162064 - HEADER INTFC MPLABICD2 64/80/100AC164327 - MODULE SKT FOR 64TQFP
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F67J60T-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
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PIC18F97J60 FAMILY
24.5
The Fail-Safe Clock Monitor (FSCM) allows the
microcontroller to continue operation in the event of an
external oscillator failure by automatically switching the
device clock to the internal oscillator block. The FSCM
function
Configuration bit.
When FSCM is enabled, the INTRC oscillator runs at
all times to monitor clocks to peripherals and provide a
backup clock in the event of a clock failure. Clock
monitoring (shown in Figure 24-4) is accomplished by
creating a sample clock signal which is the INTRC out-
put divided by 64. This allows ample time between
FSCM sample clocks for a peripheral clock edge to
occur. The peripheral device clock and the sample
clock are presented as inputs to the Clock Monitor latch
(CM). The CM is set on the falling edge of the device
clock source but cleared on the rising edge of the
sample clock.
FIGURE 24-4:
Clock failure is tested for on the falling edge of the
sample clock. If a sample clock falling edge occurs
while CM is still set, a clock failure has been detected
(Figure 24-5). This causes the following:
• the FSCM generates an oscillator fail interrupt by
• the device clock source is switched to the internal
• the WDT is reset.
DS39762E-page 360
setting bit, OSCFIF (PIR2<7>);
oscillator block (OSCCON is not updated to show
the current clock source – this is the fail-safe
condition); and
Peripheral
Source
(32 μs)
INTRC
Clock
Fail-Safe Clock Monitor
is
enabled
(2.048 ms)
488 Hz
÷ 64
FSCM BLOCK DIAGRAM
by
(edge-triggered)
Clock Monitor
Latch (CM)
C
S
setting
Q
Q
the
Detected
Failure
Clock
FCMEN
During switchover, the postscaler frequency from the
internal oscillator block may not be sufficiently stable
for timing sensitive applications. In these cases, it may
be desirable to select another clock configuration and
enter an alternate power-managed mode. This can be
done to attempt a partial recovery or execute a
controlled shutdown. See Section 3.1.4 “Multiple
Sleep Commands” and Section 24.4.1 “Special
Considerations for Using Two-Speed Start-up” for
more details.
The FSCM will detect failures of the primary or second-
ary clock sources only. If the internal oscillator block
fails, no failure would be detected, nor would any action
be possible.
24.5.1
Both the FSCM and the WDT are clocked by the
INTRC oscillator. Since the WDT operates with a
separate divider and counter, disabling the WDT has
no effect on the operation of the INTRC oscillator when
the FSCM is enabled.
As already noted, the clock source is switched to the
INTRC clock when a clock failure is detected. This may
mean a substantial change in the speed of code execu-
tion. If the WDT is enabled with a small prescale value,
a decrease in clock speed allows a WDT time-out to
occur and a subsequent device Reset. For this reason,
Fail-Safe Clock events also reset the WDT and
postscaler, allowing it to start timing from when execu-
tion speed was changed and decreasing the likelihood
of an erroneous time-out.
24.5.2
The fail-safe condition is terminated by either a device
Reset or by entering a power-managed mode. On
Reset, the controller starts the primary clock source
specified in Configuration Register 2H (with any
required start-up delays that are required for the oscil-
lator mode, such as OST or PLL timer). The INTRC
oscillator provides the device clock until the primary
clock source becomes ready (similar to a Two-Speed
Start-up). The clock source is then switched to the
primary clock (indicated by the OSTS bit in the
OSCCON register becoming set). The Fail-Safe Clock
Monitor then resumes monitoring the peripheral clock.
The primary clock source may never become ready
during start-up. In this case, operation is clocked by the
INTRC oscillator. The OSCCON register will remain in
its Reset state until a power-managed mode is entered.
FSCM AND THE WATCHDOG TIMER
EXITING FAIL-SAFE OPERATION
© 2009 Microchip Technology Inc.
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