XC68HC705JB3 Motorola, XC68HC705JB3 Datasheet - Page 27

• Manufacturer Part Number: XC68HC705JB3
• Description: MICROCONTROLLER
• Manufacturer: Motorola

3.1
MC68HC05JB3
REV 1
The MC68HC05JB3 has an 8k-bytes memory map. The stack has only 64 bytes.
Therefore, the stack pointer has been reduced to only 6 bits and will only
decrement down to $00C0 and then wrap-around to $00FF. All other instructions
and registers behave as described in this chapter.
REGISTERS
The MCU contains five registers which are hard-wired within the CPU and are not
part of the memory map. These five registers are shown in Figure 3-1 and are
described in the following paragraphs.
15
0
14
0
13
CONDITION CODE REGISTER
0
Figure 3-1. MC68HC05 Programming Model
12
0
CENTRAL PROCESSING UNIT
11
0
HALF-CARRY BIT (FROM BIT 3)
10
CENTRAL PROCESSING UNIT
0
PROGRAM COUNTER
9
0
November 5, 1998
SECTION 3
8
0
INTERRUPT MASK
NEGATIVE BIT
7
1
1
CARRY BIT
ZERO BIT
6
1
1
5
1
INDEX REGISTER
ACCUMULATOR
GENERAL RELEASE SPECIFICATION
STACK POINTER
H
4
3
I
N
2
Z
1
C
0
SP
PC
CC
A
X
MOTOROLA
3-1