MB89P935C Fujitsu Microelectronics, Inc., MB89P935C Datasheet - Page 17

• Manufacturer Part Number: MB89P935C
• Description: 8-bit Proprietary Microcontroller
• Manufacturer: Fujitsu Microelectronics, Inc.

2. Registers
The F
in the memory. The following dedicated registers are provided:
Program counter (PC):
Accumulator (A):
Temporary accumulator (T): A 16-bit register which performs arithmetic operations with the accumulator.
Index register (IX):
Extra pointer (EP):
Stack pointer (SP):
Program status (PS):
The PS can further be divided into higher 8 bits for use as a register bank pointer (RP) and the lower 8 bits for
use as a condition code register (CCR). (See the diagram below.)
Structure of the Program Status Register
2
MC-8L family has two types of registers; dedicated registers in the CPU and general-purpose registers
PS
X : Undefined
15
14
RP
13
12
RP
A 16-bit register for indicating instruction storage positions
A 16-bit temporary register for storing arithmetic operations, etc. When the
instruction is an 8-bit data processing instruction, the lower byte is used.
When the instruction is an 8-bit data processing instruction, the lower byte is used.
A 16-bit register for index modification
A 16-bit pointer for indicating a memory address
A 16-bit register for indicating a stack area
A 16-bit register for storing a register pointer, a condition code
16 bits
PC
EP
SP
PS
IX
A
T
H-flag
I-flag
IL1,0
N-flag
Z-flag
V-flag
C-flag
11
Vacancy Vacancy Vacancy
10
9
8
: Program counter
: Accumulator
: Temporary accumulator
: Index register
: Extra pointer
: Stack pointer
: Program status
H
7
6
I
5
IL1, 0
4
CCR
I-flag = 0, IL1, 0 = 11
Other bits are undefined.
MB89930C Series
N
3
Initial value
Undefined
Undefined
Undefined
Undefined
Undefined
2
Z
FFFD
V
1
H
C
0
CCR initial value
X011XXXX
B
17