參數(shù)資料
型號: HMS97C7134
英文描述: [Monitor]
中文描述: [顯示器]
文件頁數(shù): 16/86頁
文件大?。?/td> 1508K
代理商: HMS97C7134
HMS91C7134
16
November.2001 ver1.0
8. MEMORY ORGANIZATION
The HMS91C7132 has separate address spaces for Program
memory, Data Memory. Program memory can only be read, not
written to. It can be up to 32K bytes of Program memory.(OPT
type: HMS97C7134 32K bytes)
Data memory can be read and written to up to 256 bytes including
the stack area.(Internal RAM) and 256bytes (External RAM:
256bytes of XRAM0).
Figure 8-1 Memory map and address spaces
8.1 Registers
This device has several registers that are the Program Counter
(PC), Accumulator (A), B register(B), the Stack Pointer (SP), the
Program Status Word(PSW), General purpose regis-
ter(R0~R7)and DPTR(Data pointer register).
Figure 8-2 Configuration of Registers
Accumulator:
The Accumulator is the 8-bit general purpose reg-
ister, used for data operation such as transfer, temporary saving,
and conditional judgement, etc. The Accumulator can be used as
a 16-bit register with B Register as shown below.
Figure 8-3 Configuration of BA 16-bit Registers
B Register:
The B Register is the 8-bit purpose register, used for
an arithmatic operation such as multiply, division with Accumu-
lator
Stack Pointer
: The Stack Pointer is an 8-bit register used for oc-
currence interrupts and calling out subroutines. Stack Pointer
identifies the location in the stack to be access (save or re-
store).The stack can be located at any position within 0000
H
to
007F
H
of the internal data memory. The SP is not initialized by
hardware, requiring to write the initial value (the location with
32K ROM
Indirect
only
(“mov @ri”)
Direct(“mov”)
or Indirect
(“mov @ri”)
0
127
255
Direct
(“mov”) or
Indirect
(“mov @ri” )
Indirect
(“movx @ri” or
movx @dptr)
(XRAMS = 0)
data memory
program memory
SFR
XRAM
RAM
A
ACCUMULATOR
STACK POINTER
PROGRAM COUNTER
PROGRAM STATUS
WORD
SP
PCL
PCH
PSW
R0~R7
GENERAL PURPOSE
REGISTER (BANK0~3)
B
B REGISTER
DPTR(DPL)
DPTR(DPH)
DATA POINTER
REGISTER
Two 8-bit Registers can be used as a "BA" 16-bit Register
B
A
B
A
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