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參數(shù)資料
| 型號： | HMS81C43XX |
| 廠商： | Hynix Semiconductor Inc. |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION |
| 中文描述： | CMOS單芯片8位單片機電視 |
| 文件頁數(shù)： | 18/100頁 |
| 文件大?。?/td> | 1943K |
| 代理商： | HMS81C43XX |
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HMS81C43xx / GMS87C4060
18
November 2001 ver 1.2
8. MEMORY ORGANIZATION
The GMS81C43xx/GMS87C4060 has separate address
spaces for Program memory, Data Memory and Display
memory. Program memory can only be read, not written
to. It can be up to 32K/60K bytes of Program memory.
Data memory can be read and written to up to 256~512/
1,536 bytes including the stack area. Font memory has pre-
pared 16K bytes for OSD.
8.1 Registers
This device has six registers that are the Program Counter
(PC), a Accumulator (A), two index registers (X, Y), the
Stack Pointer (SP), and the Program Status Word (PSW).
The Program Counter consists of 16-bit register.
Figure 8-1 Configuration of Registers
Accumulator:
The Accumulator is the 8-bit general pur-
pose register, used for data operation such as transfer, tem-
porary saving, and conditional judgement, etc.
The Accumulator can be used as a 16-bit register with Y
Register as shown below.
Figure 8-2 Configuration of YA 16-bit Register
X, Y Registers
: In the addressing mode which uses these
index registers, the register contents are added to the spec-
ified address, which becomes the actual address. These
modes are extremely effective for referencing subroutine
tables and memory tables. The index registers also have in-
crement, decrement, comparison and data transfer func-
tions, and they can be used as simple accumulators.
Stack Pointer
: The Stack Pointer is an 8-bit register used
for occurrence interrupts and calling out subroutines. Stack
Pointer identifies the location in the stack to be accessed
(save or restore).
Generally, SP is automatically updated when a subroutine
call is executed or an interrupt is accepted. However, if it
is used in excess of the stack area permitted by the data
memory allocating configuration, the user-processed data
may be lost.
The stack can be located at any position within 0100
H
to
01FF
H
of the internal data memory. The SP is not initial-
ized by hardware, requiring to write the initial value (the
location with which the use of the stack starts) by using the
initialization routine. Normally, the initial value of "FF
H
"
is used.
Program Counter
: The Program Counter is a 16-bit wide
which consists of two 8-bit registers, PCH and PCL. This
counter indicates the address of the next instruction to be
executed. In reset state, the program counter has reset rou-
tine address (PC
H
:0FF
H
, PC
L
:0FE
H
).
Program Status Word
: The Program Status Word (PSW)
contains several bits that reflect the current state of the
CPU. The PSW is described in Figure 8-3 . It contains the
Negative flag, the Overflow flag, the Break flag the Half
Carry (for BCD operation), the Interrupt enable flag, the
Zero flag, and the Carry flag.
[Carry flag C]
This flag stores any carry or borrow from the ALU of CPU
A
ACCUMULATOR
X REGISTER
Y REGISTER
STACK POINTER
PROGRAM COUNTER
PROGRAM STATUS
WORD
X
Y
SP
PCL
PCH
PSW
Two 8-bit Registers can be used as a "YA" 16-bit Register
Y
A
Y
A
Caution:
The Stack Pointer must be initialized by software be-
cause its value is undefined after RESET.
Example: To initialize the SP for 81C4324 (256 RAM)
LDX
TXSP
#03FH
; SP
←
3F
H
SP
01
Stack Address ( 0100
H
~ 013F or 01FF
H
)
8
7
15
0
Hardware fixed
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