PIC18LC658-I/CL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LC658-I/CL

High-Performance Microcontrollers with CAN Module

Microchip Technology 

PIC18CXX8

REGISTER 4-1:

STKPTR - STACK POINTER REGISTER

R/C-0

R/C-0

U-0

STKFUL STKUNF

—

bit 7

R/W-0

SP4

R/W-0

SP3

R/W-0

SP2

R/W-0

SP1

R/W-0

SP0

bit 0

bit 7 STKFUL: Stack Full Flag bit

1 = Stack became full or overflowed

0 = Stack has not become full or overflowed

bit 6 STKUNF: Stack Underflow Flag bit

1 = Stack underflow occurred

0 = Stack underflow did not occur

bit 5

bit 4-0

Unimplemented: Read as '0'

SP4:SP0: Stack Pointer Location bits

Note: Bit 7 and bit 6 can only be cleared in user software or by a POR.

Legend

R = Readable bit

W = Writable bit U = Unimplemented bit, read as ‘0’

- n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared C = Clearable bit

FIGURE 4-2: RETURN ADDRESS STACK AND ASSOCIATED REGISTERS

TOSU

0x00

TOSH

0x1A

Return Address Stack

TOSL

0x34

11111

11110

11101

STKPTR<4:0>

00010

00011

Top-of-Stack 0x001A34 00010

0x000D58 00001

0x000000 00000(1)

Note 1: No RAM associated with this address; always maintained ‘0’s.

 2000 Microchip Technology Inc.

Advanced Information

DS30475A-page 43

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