參數(shù)資料
型號: P87C591SFA
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: Single-chip 8-bit microcontroller with CAN controller
中文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, SOT-187-2, LCC-44
文件頁數(shù): 19/161頁
文件大小: 588K
代理商: P87C591SFA
1999 Aug 19
19
Philips Semiconductors
Objective Specification
Single-chip 8-bit microcontroller with CAN controller
P8xC591
Fig.7 Dual DPTR:
handbook, full pagewidth
DPH
(83H)
BT0
AUXR1
DPS
DPL
(82H)
EXTERNAL
DATA
MEMORY
DPTR0
MHI007
DPTR1
7.4
Dual DPTR
The dual DPTR structure (see Figure 7) is a way by which
the chip will specify the address of an external data
memory location. There are two 16-bit DPTR registers that
address the external memory, and a single bit called DPS
= AUXR1/bit0 that allows the program code to switch
between them.
The DPS bit status should be saved by software when
switching between DPTR0 and DPTR1.
Note that bit 2 is not writable and is always read as a zero.
This allows the DPS bit to be quickly toggled simply by
executing an INC AUXR1 instruction without affecting the
other bits.
DPTR Instructions
The instructions that refer to DPTR refer to the data pointer
that is currently selected using the AUXR1/bit 0 register.
The six instructions that use the DPTR are as follows:
INC DPTRIncrements the data pointer by 1
MCV DPTR, #data 16
constant
MOV A, @ A+DPTR
Loads the DPTR with a 16-bit
Move code byte relative to
DPTR to ACC
Move external RAM (16-bit
address) to ACC
Move ACC to external RAM
(16-bit address)
Jump indirect relative to
DPTR
MOVX A, @ DPTR
MOVX @ DPTR, A
JMP @ A + DPTR
The data pointer can be accessed on a byte-by-byte basis
by specifying the low or high byte in an instruction which
accesses the SFRs. See application note AN458 for more
details.
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