PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 43

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

REGISTER 4-1:
FIGURE 4-2:
 2000 Microchip Technology Inc.
Note 1: No RAM associated with this address; always maintained ‘0’s.
bit 7
bit 6
bit 5
bit 4-0
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
TOSU
0x00
STKPTR - STACK POINTER REGISTER
bit 7
STKFUL: Stack Full 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
Note:
Legend
R = Readable bit
- n = Value at POR
STKFUL
R/C-0
Bit 7 and bit 6 can only be cleared in user software or by a POR.
TOSH
0x1A
STKUNF
R/C-0
Advanced Information
Top-of-Stack
TOSL
0x34
’1’ = Bit is set
U-0
W = Writable bit
—
Return Address Stack
0x001A34
0x000D58
0x000000
R/W-0
SP4
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
11111
11110
11101
00011
00010
00001
00000
R/W-0
SP3
(1)
STKPTR<4:0>
R/W-0
00010
SP2
PIC18CXX8
C = Clearable bit
R/W-0
SP1
DS30475A-page 43
R/W-0
SP0
bit 0