DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 96
![BOARD DEMO FOR 9S08 EL MCU](/photos/9/23/92304/demo9s08el32_sml.jpg)
DEMO9S08EL32
Manufacturer Part Number
DEMO9S08EL32
Description
BOARD DEMO FOR 9S08 EL MCU
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheets
1.DEMO9S08EL32.pdf
(356 pages)
2.DEMO9S08EL32.pdf
(14 pages)
3.DEMO9S08EL32.pdf
(2 pages)
Specifications of DEMO9S08EL32
Contents
Evaluation Board
Processor To Be Evaluated
MC9S08EL32
Data Bus Width
8 bit
Interface Type
RS-232, USB
Operating Supply Voltage
12 V
Silicon Manufacturer
Freescale
Core Architecture
HCS08
Core Sub-architecture
HCS08
Silicon Core Number
MC9S08
Silicon Family Name
S08EL
Rohs Compliant
Yes
For Use With/related Products
MC9S08EL32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Chapter 7 Central Processor Unit (S08CPUV3)
7.2
Figure 7-1
7.2.1
The A accumulator is a general-purpose 8-bit register. One operand input to the arithmetic logic unit
(ALU) is connected to the accumulator and the ALU results are often stored into the A accumulator after
arithmetic and logical operations. The accumulator can be loaded from memory using various addressing
modes to specify the address where the loaded data comes from, or the contents of A can be stored to
memory using various addressing modes to specify the address where data from A will be stored.
Reset has no effect on the contents of the A accumulator.
7.2.2
This 16-bit register is actually two separate 8-bit registers (H and X), which often work together as a 16-bit
address pointer where H holds the upper byte of an address and X holds the lower byte of the address. All
indexed addressing mode instructions use the full 16-bit value in H:X as an index reference pointer;
however, for compatibility with the earlier M68HC05 Family, some instructions operate only on the
low-order 8-bit half (X).
Many instructions treat X as a second general-purpose 8-bit register that can be used to hold 8-bit data
values. X can be cleared, incremented, decremented, complemented, negated, shifted, or rotated. Transfer
instructions allow data to be transferred from A or transferred to A where arithmetic and logical operations
can then be performed.
For compatibility with the earlier M68HC05 Family, H is forced to 0x00 during reset. Reset has no effect
on the contents of X.
96
Programmer’s Model and CPU Registers
shows the five CPU registers. CPU registers are not part of the memory map.
Accumulator (A)
Index Register (H:X)
H
CONDITION CODE REGISTER
15
15
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
INDEX REGISTER (HIGH)
16-BIT INDEX REGISTER H:X
PROGRAM COUNTER
STACK POINTER
Figure 7-1. CPU Registers
8
V 1 1 H I N Z
7
7
7
INDEX REGISTER (LOW)
ACCUMULATOR
C
0
0
0
0
CARRY
ZERO
NEGATIVE
INTERRUPT MASK
HALF-CARRY (FROM BIT 3)
TWO’S COMPLEMENT OVERFLOW
SP
PC
CCR
A
X
Freescale Semiconductor
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