PIC16F84A-04/P Microchip Technology Inc., PIC16F84A-04/P Datasheet - Page 13
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PIC16F84A-04/P
Manufacturer Part Number
PIC16F84A-04/P
Description
18 PIN, 1.75 KB FLASH, 68 RAM, 13 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F84A-04P.pdf
(88 pages)
Specifications of PIC16F84A-04/P
Cpu Speed
5 MIPS
Eeprom Memory
64 Bytes
Input Output
13
Memory Type
Flash
Number Of Bits
8
Package Type
18-pin PDIP
Programmable Memory
1.75K Bytes
Ram Size
68 Bytes
Speed
20 MHz
Timers
1-8-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F84A-04/P
Manufacturer:
MICROCHIP
Quantity:
1 450
2.4
The program counter (PC) specifies the address of the
instruction to fetch for execution. The PC is 13 bits
wide. The low byte is called the PCL register. This reg-
ister is readable and writable. The high byte is called
the PCH register. This register contains the PC<12:8>
bits and is not directly readable or writable. If the pro-
gram counter (PC) is modified or a conditional test is
true, the instruction requires two cycles. The second
cycle is executed as a NOP. All updates to the PCH reg-
ister go through the PCLATH register.
2.4.1
The stack allows a combination of up to 8 program calls
and interrupts to occur. The stack contains the return
address from this branch in program execution.
Mid-range devices have an 8 level deep x 13-bit wide
hardware stack. The stack space is not part of either
program or data space and the stack pointer is not
readable or writable. The PC is PUSHed onto the stack
when a CALL instruction is executed or an interrupt
causes a branch. The stack is POPed in the event of a
RETURN, RETLW or a RETFIE instruction execution.
PCLATH is not modified when the stack is PUSHed or
POPed.
After the stack has been PUSHed eight times, the ninth
push overwrites the value that was stored from the first
push. The tenth push overwrites the second push (and
so on).
2001 Microchip Technology Inc.
PCL and PCLATH
STACK
2.5
The INDF register is not a physical register. Addressing
INDF actually addresses the register whose address is
contained in the FSR register (FSR is a pointer ). This is
indirect addressing.
EXAMPLE 2-1:
Reading INDF itself indirectly (FSR = 0) will produce
00h. Writing to the INDF register indirectly results in a
no-operation (although STATUS bits may be affected).
A simple program to clear RAM locations 20h-2Fh
using indirect addressing is shown in Example 2-2.
EXAMPLE 2-2:
An effective 9-bit address is obtained by concatenating
the 8-bit FSR register and the IRP bit (STATUS<7>), as
shown in Figure 2-3. However, IRP is not used in the
PIC16F84A.
• Register file 05 contains the value 10h
• Register file 06 contains the value 0Ah
• Load the value 05 into the FSR register
• A read of the INDF register will return the value
• Increment the value of the FSR register by one
• A read of the INDF register now will return the
NEXT
CONTINUE
of 10h
(FSR = 06)
value of 0Ah.
Indirect Addressing; INDF and
FSR Registers
movlw
movwf
clrf
incf
btfss
goto
:
0x20
FSR
INDF
FSR
FSR,4
NEXT
INDIRECT ADDRESSING
HOW TO CLEAR RAM
USING INDIRECT
ADDRESSING
PIC16F84A
;initialize pointer
;to RAM
;clear INDF register
;inc pointer
;all done?
;NO, clear next
;YES, continue
DS35007B-page 11