16F84 MICROCHIP [Microchip Technology], 16F84 Datasheet - Page 113
16F84
Manufacturer Part Number
16F84
Description
18-pin Flash/EEPROM 8-Bit Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.16F84.pdf
(124 pages)
- Current page: 113 of 124
- Download datasheet (2Mb)
APPENDIX A: FEATURE
The following is the list of feature improvements over
the PIC16C5X microcontroller family:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Wake up from SLEEP through interrupt is
11. Two separate timers, the Oscillator Start-up
12. PORTB has weak pull-ups and interrupt on
13. T0CKI pin is also a port pin (RA4/T0CKI).
14. FSR is a full 8-bit register.
15. "In system programming" is made possible. The
1998 Microchip Technology Inc.
Instruction word length is increased to 14 bits.
This allows larger page sizes both in program
memory (2K now as opposed to 512 before) and
the register file (128 bytes now versus 32 bytes
before).
A PC latch register (PCLATH) is added to handle
program memory paging. PA2, PA1 and PA0 bits
are removed from the status register and placed
in the option register.
Data memory paging is redefined slightly. The
STATUS register is modified.
Four new instructions have been added:
RETURN, RETFIE, ADDLW, and SUBLW. Two
instructions, TRIS and OPTION, are being
phased out although they are kept for
compatibility with PIC16C5X.
OPTION
addressable.
Interrupt capability is added. Interrupt vector is
at 0004h.
Stack size is increased to 8 deep.
Reset vector is changed to 0000h.
Reset of all registers is revisited. Five different
reset (and wake-up) types are recognized.
Registers are reset differently.
added.
Timer (OST) and Power-up Timer (PWRT), are
included for more reliable power-up. These
change features.
(data in/out).
timers
unnecessary delays on power-up and wake-up.
user can program PIC16CXX devices using only
five pins: V
are
and TRIS
DD
, V
invoked
IMPROVEMENTS -
FROM PIC16C5X TO
PIC16F8X
SS
, V
PP
, RB6 (clock) and RB7
selectively
registers
are
to
made
avoid
APPENDIX B: CODE COMPATIBILITY
To convert code written for PIC16C5X to PIC16F8X,
the user should take the following steps:
1.
2.
3.
4.
5.
Remove any program memory page select
operations (PA2, PA1, PA0 bits) for CALL, GOTO.
Revisit any computed jump operations (write to
PC or add to PC, etc.) to make sure page bits
are set properly under the new scheme.
Eliminate any data memory page switching.
Redefine data variables for reallocation.
Verify all writes to STATUS, OPTION, and FSR
registers since these have changed.
Change reset vector to 0000h.
- FROM PIC16C5X TO
PIC16F8X
PIC16F8X
DS30430C-page 113
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