PIC18LF6310T-I/PT Microchip Technology, PIC18LF6310T-I/PT Datasheet - Page 70

• Manufacturer Part Number: PIC18LF6310T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF6310T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F6310/6410/8310/8410
6.1.2
The Program Counter (PC) specifies the address of the
instruction to fetch for execution. The PC is 21 bits wide
and is contained in three separate 8-bit registers. The
low byte, known as the PCL register, is both readable
and writable. The high byte, or PCH register, contains
the PC<15:8> bits; it is not directly readable or writable.
Updates to the PCH register are performed through the
PCLATH register. The upper byte is called PCU. This
register contains the PC<20:16> bits; it is also not
directly readable or writable. Updates to the PCU
register are performed through the PCLATU register.
The contents of PCLATH and PCLATU are transferred
to the program counter by any operation that writes
PCL. Similarly, the upper two bytes of the program
counter are transferred to PCLATH and PCLATU by an
operation that reads PCL. This is useful for computed
offsets to the PC (see
GOTO”).
The PC addresses bytes in the program memory. To
prevent the PC from becoming misaligned with word
instructions, the Least Significant bit of PCL is fixed to
a value of ‘0’. The PC increments by 2 to address
sequential instructions in the program memory.
The CALL,
instructions write to the program counter directly. For
these instructions, the contents of PCLATH and
PCLATU are not transferred to the program counter.
6.1.3
The Return Address Stack allows any combination of
up to 31 program calls and interrupts to occur. The PC
is pushed onto the stack when a CALL or RCALL
instruction is executed, or an interrupt is Acknowl-
edged. The PC value is pulled off the stack on a
RETURN, RETLW or a RETFIE instruction. PCLATU and
PCLATH are not affected by any of the RETURN or
CALL instructions.
FIGURE 6-3:
DS39635C-page 70
PROGRAM COUNTER
RETURN ADDRESS STACK
RCALL,
Top-of-Stack Registers
TOSU
00h
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
TOSH
Section 6.1.5.1 “Computed
GOTO and program branch
1Ah
TOSL
34h
Top-of-Stack
Return Address Stack<20:0>
001A34h
000D58h
The stack operates as a 31-word by 21-bit RAM and a
5-bit Stack Pointer register, STKPTR. The stack space
is not part of either program or data space. The Stack
Pointer is readable and writable and the address on the
top of the stack is readable and writable through the
Top-of-Stack (TOS) Special File Registers. Data can
also be pushed to or popped from the stack using these
registers.
A CALL type instruction causes a push onto the stack;
the Stack Pointer is first incremented and the location
pointed to by the Stack Pointer is written with the
contents of the PC (already pointing to the instruction
following the CALL). A RETURN type instruction causes
a pop from the stack; the contents of the location
pointed to by the STKPTR are transferred to the PC
and then the Stack Pointer is decremented.
The Stack Pointer is initialized to ‘00000’ after all
Resets. There is no RAM associated with the location
corresponding to a Stack Pointer value of ‘00000’; this
is only a Reset value. Status bits indicate if the stack is
full, has overflowed or has underflowed.
6.1.3.1
Only the top of the Return Address Stack (TOS) is
readable and writable. A set of three registers,
TOSU:TOSH:TOSL, hold the contents of the stack
location
(Figure
stack if necessary. After a CALL, RCALL or interrupt, the
software can read the pushed value by reading the
TOSU:TOSH:TOSL registers. These values can be
placed on a user-defined software stack. At return time,
the
TOSU:TOSH:TOSL and do a return.
The user must disable the global interrupt enable bits
while accessing the stack to prevent inadvertent stack
corruption.
11111
11110
11101
00011
00010
00001
00000
software
6-3). This allows users to implement a software
pointed
Top-of-Stack Access
can
to
 2010 Microchip Technology Inc.
by
return
Stack Pointer
STKPTR<4:0>
00010
the
these
STKPTR
values
register
to