PIC18F4320-I/PT Microchip Technology, PIC18F4320-I/PT Datasheet - Page 3

• Manufacturer Part Number: PIC18F4320-I/PT
• Description: IC MCU FLASH 4KX16 A/D 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4320-I/PT

• Core Size: 8-Bit
• Program Memory Size: 8KB (4K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• 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, Lead free / RoHS Compliant

4. Module: Oscillator
© 2009 Microchip Technology Inc.
The 32 kHz internal oscillator, INTRC, will be held
in Reset if either of the following is enabled:
• Power-up Timer
• High-Speed Crystal/Resonator with PLL
Without the INTRC oscillator running, the Power-up
Timer and Phase Locked Loop (PLL) timer will not
expire
device will not exit Reset. This issue does not affect
the Watchdog Timer or any other mode.
The provided work arounds require only two
modifications to the Configuration Word values.
No additional changes to the application hardware
or software are necessary, except as noted below.
Work around: Power-up Timer
Disable the Power-up Timer by programming
PWRTEN (CONFIG2L<0>) to ‘1’. This results in a
shorter time before the microcontroller begins to
execute code after power up or exiting from Sleep
mode or from Brown-out Reset (if enabled).
If a power-up delay is needed to ensure a stable
V
feature. The BOR keeps the device in Reset until
the specified V
This work around is available by programming the
BOR bit to ‘1’ and selecting BOR voltage bits with
BORV<1:0> bits in the CONFIG2L Configuration
Word.
If BOR is not enabled and additional start-up delay
is needed, consider implementing an external
system supervisor to keep the microcontroller in
Reset until the V
consider use of an equivalent PIC18F4321 device.
Work around: HSPLL Oscillator Mode
Two work arounds are available through the
Configuration bits. Enabling either of the following
features permits the HSPLL mode to work
successfully:
• Two-Speed Start-up
• Fail-Safe Clock Monitor
DD
Enabled (HSPLL) Oscillator mode
, consider using the Brown-out Reset (BOR)
and
DD
the
has been achieved.
DD
PIC18F2220/2320/4220/4320
has stabilized. Alternately,
PIC18F2220/2320/4220/4320
Both options permit the microcontroller to start
from the 32 kHz INTRC after power-up, BOR, or
wake-up from Sleep mode. The options also
permit code to execute while PLL is waiting to lock.
The PLL lock time typically is 2 ms which results in
approximately 16 instruction executions before the
switch to the HSPLL clock occurs. If typical initial-
ization code is performed after a Power-on Reset
or Brown-out Reset, the impact of this work around
should be negligible.
If Sleep mode is used, both work arounds result in
code execution during PLL lock time. A software
delay may be needed to avoid executing time-crit-
ical
(OSCCON<3>) bit will set to indicate when the
HSPLL is ready and time-critical code can be
executed.
The Two-Speed Start-up and Fail-Safe Clock
Monitor work arounds switch the system clock
source from INTRC to HSPLL mode after a PLL
lock occurs. This is handled automatically by the
microcontroller and requires no additional soft-
ware or special monitoring. For more information,
see Section 2.7 “Clock Sources and Oscillator
Switching” in the “PIC18F2220/2320/4220/4320
Data Sheet” (DS39599).
Date Codes that pertain to this issue:
Engineering and production devices with a date
code of 0813 or later may be affected.
code
after
wake-up.
DS80396B-page 3
The
OSTS