PIC18F24J10-E/ML MICROCHIP [Microchip Technology], PIC18F24J10-E/ML Datasheet - Page 51
![no-image](/images/no-image-200.jpg)
PIC18F24J10-E/ML
Manufacturer Part Number
PIC18F24J10-E/ML
Description
28/40/44-Pin High-Performance RISC Microcontrollers with nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24J10-EML.pdf
(358 pages)
- Current page: 51 of 358
- Download datasheet (6Mb)
5.1.2.2
The STKPTR register (Register 5-1) contains the Stack
Pointer value, the STKFUL (Stack Overflow) status bit
and the STKUNF (Stack Underflow) status bits. The
value of the Stack Pointer can be 0 through 31. The
Stack Pointer increments before values are pushed
onto the stack and decrements after values are popped
off the stack. On Reset, the Stack Pointer value will be
zero. The user may read and write the Stack Pointer
value. This feature can be used by a Real-Time
Operating
maintenance.
After the PC is pushed onto the stack 31 times (without
popping any values off the stack), the STKFUL bit is
set. The STKFUL bit is cleared by software or by a
POR.
The action that takes place when the stack becomes
full depends on the state of the STVREN (Stack Over-
flow Reset Enable) configuration bit. (Refer to
Section 20.1 “Configuration Bits” for a description of
the device configuration bits.) If STVREN is set
(default), the 31st push will push the (PC + 2) value
onto the stack, set the STKFUL bit and reset the
device. The STKFUL bit will remain set and the Stack
Pointer will be set to zero.
If STVREN is cleared, the STKFUL bit will be set on the
31st push and the Stack Pointer will increment to 31.
Any additional pushes will not overwrite the 31st push
and the STKPTR will remain at 31.
REGISTER 5-1:
© 2007 Microchip Technology Inc.
bit 7
bit 6
bit 5
bit 4-0
System
Return Stack Pointer (STKPTR)
STKPTR: STACK POINTER REGISTER
bit 7
STKFUL: Stack Overflow Flag bit
1 = Stack became full or overflowed
0 = Stack has not become full or overflowed
STKUNF: Stack Underflow Flag bit
1 = Stack underflow occurred
0 = Stack underflow did not occur
Unimplemented: Read as ‘0’
SP4:SP0: Stack Pointer Location bits
(RTOS)
Legend:
R = Readable bit
-n = Value at POR
STKFUL
Note 1: Bit 7 and bit 6 are cleared by user software or by a POR.
R/C-0
(1)
for
STKUNF
R/C-0
return
(1)
W = Writable bit
‘1’ = Bit is set
stack
Preliminary
U-0
—
(1)
(1)
PIC18F45J10 FAMILY
R/W-0
When the stack has been popped enough times to
unload the stack, the next pop will return a value of zero
to the PC and sets the STKUNF bit, while the Stack
Pointer remains at zero. The STKUNF bit will remain
set until cleared by software or until a POR occurs.
5.1.2.3
Since the Top-of-Stack is readable and writable, the
ability to push values onto the stack and pull values off
the stack without disturbing normal program execution
is a desirable feature. The PIC18 instruction set
includes two instructions, PUSH and POP, that permit
the TOS to be manipulated under software control.
TOSU, TOSH and TOSL can be modified to place data
or a return address on the stack.
The PUSH instruction places the current PC value onto
the stack. This increments the Stack Pointer and loads
the current PC value onto the stack.
The POP instruction discards the current TOS by decre-
menting the Stack Pointer. The previous value pushed
onto the stack then becomes the TOS value.
SP4
Note:
U = Unimplemented
‘0’ = Bit is cleared
R/W-0
Returning a value of zero to the PC on an
underflow has the effect of vectoring the
program to the Reset vector, where the
stack conditions can be verified and
appropriate actions can be taken. This is
not the same as a Reset, as the contents
of the SFRs are not affected.
SP3
PUSH and POP Instructions
R/W-0
SP2
C = Clearable only bit
x = Bit is unknown
R/W-0
SP1
DS39682C-page 49
R/W-0
SP0
bit 0
Related parts for PIC18F24J10-E/ML
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![PIC18F2480](/images/no-image3.png)
Part Number:
Description:
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC18F2682-I/PT](/images/no-image3.png)
Part Number:
Description:
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![MCP4024](/images/no-image3.png)
Part Number:
Description:
Low-Cost NV Digital POT with WiperLock™ Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC12F1516](/images/no-image3.png)
Part Number:
Description:
28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC12F1822](/images/no-image3.png)
Part Number:
Description:
8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC12F1840](/images/no-image3.png)
Part Number:
Description:
8-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC12F635-E/MD](/images/no-image3.png)
Part Number:
Description:
8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![PIC12F683-E/MD](/images/no-image3.png)
Part Number:
Description:
8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![TC1263](/images/no-image3.png)
Part Number:
Description:
500mA Fixed Output CMOS LDO with Shutdown
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![TC1268](/images/no-image3.png)
Part Number:
Description:
500mA Fixed Output, Fast Response CMOS LDO with Shutdown
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![TC4405](/images/no-image3.png)
Part Number:
Description:
1.5A Dual Open-Drain MOSFET Drivers
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![TC4428](/images/no-image3.png)
Part Number:
Description:
1.5A DUAL HIGH-SPEED POWER MOSFET DRIVERS
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet:
![MCP41100](/images/no-image3.png)
Part Number:
Description:
Single/Dual Digital Potentiometer with SPI™ Interface
Manufacturer:
MICROCHIP [Microchip Technology]
Datasheet: