PIC18LF1320-I/P Microchip Technology, PIC18LF1320-I/P Datasheet - Page 44
![IC MCU FLASH 4KX16 EEPROM 18DIP](/photos/6/76/67657/18-dip_300mil__sml.jpg)
PIC18LF1320-I/P
Manufacturer Part Number
PIC18LF1320-I/P
Description
IC MCU FLASH 4KX16 EEPROM 18DIP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F1220-ISO.pdf
(308 pages)
3.PIC18F1220-ISO.pdf
(8 pages)
4.PIC18F1220-ISO.pdf
(6 pages)
5.PIC18F1220-ISO.pdf
(10 pages)
6.PIC18F1220-ISO.pdf
(4 pages)
Specifications of PIC18LF1320-I/P
Core Size
8-Bit
Program Memory Size
8KB (4K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
16
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 7x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
18-DIP (0.300", 7.62mm)
Controller Family/series
PIC18
No. Of I/o's
16
Eeprom Memory Size
256Byte
Ram Memory Size
256Byte
Cpu Speed
40MHz
No. Of Timers
4
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
EUSART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
16
Number Of Timers
1 x 16 bit
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DM163014, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
7
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PIC18LF1320-I/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
PIC18F1220/1320
5.2
The return address stack allows any combination of up
to 31 program calls and interrupts to occur. The PC
(Program Counter) is pushed onto the stack when a
CALL or RCALL instruction is executed, or an interrupt
is Acknowledged. 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.
The stack operates as a 31-word by 21-bit RAM and a
5-bit stack pointer, with the Stack Pointer initialized to
00000
with Stack Pointer, 00000
During a CALL type instruction, causing a push onto the
stack, the Stack Pointer is first incremented and the
RAM location pointed to by the Stack Pointer
(STKPTR) register is written with the contents of the PC
(already pointing to the instruction following the CALL).
During a RETURN type instruction, causing a pop from
the stack, the contents of the RAM location pointed to
by the STKPTR are transferred to the PC and then the
Stack Pointer is decremented.
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
Registers. Data can also be pushed to or popped from
the stack using the top-of-stack SFRs. Status bits
indicate if the stack is full, has overflowed or
underflowed.
5.2.1
The top of the stack is readable and writable. Three
register locations, TOSU, TOSH and TOSL, hold the
contents of the stack location pointed to by the
STKPTR register (Figure 5-3). This allows users to
implement a software stack if necessary. After a CALL,
RCALL or interrupt, the software can read the pushed
value by reading the TOSU, TOSH and TOSL registers.
These values can be placed on a user defined software
stack. At return time, the software can replace the
TOSU, TOSH and TOSL and do a return.
The user must disable the global interrupt enable bits
while accessing the stack to prevent inadvertent stack
corruption.
FIGURE 5-3:
DS39605F-page 42
B
after all Resets. There is no RAM associated
Return Address Stack
through
TOP-OF-STACK ACCESS
the
TOSU
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
00h
B
top-of-stack
. This is only a Reset value.
TOSH
1Ah
Special
Top-of-Stack
TOSL
File
34h
Return Address Stack
5.2.2
The STKPTR register (Register 5-1) contains the stack
pointer value, the STKFUL (Stack Full) 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. At 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
System for return stack 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 STVR (Stack Overflow
Reset Enable) configuration bit. (Refer to Section 19.1
“Configuration Bits” for a description of the device
configuration bits.) If STVR 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 STVR 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 STKPTR will remain at 31.
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 a POR occurs.
001A34h
000D58h
Note:
RETURN STACK POINTER
(STKPTR)
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.
11111
11110
11101
00011
00010
00001
00000
STKPTR<4:0>
© 2007 Microchip Technology Inc.
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