参数资料
型号: P87C51RA2BA,512
厂商: NXP Semiconductors
文件页数: 26/67页
文件大小: 0K
描述: IC 80C51 MCU 512 RAM 44PLCC
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 26
系列: 87C
核心处理器: 8051
芯体尺寸: 8-位
速度: 33MHz
连通性: EBI/EMI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
其它名称: 568-7904-5
568-7904-5-ND
568-8355-5
935271889512
P87C51RA2BA
P87C51RA2BA,512-ND
P87C51RA2BA-ND
Philips Semiconductors
Product data
P87C51RA2/RB2/RC2/RD2
80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP
with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high
speed (30/33 MHz)
2003 Jan 24
32
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the
ALE output unless the CPU needs to perform an off-chip memory
access.
Reduced EMI Mode
AUXR (8EH)
7
6
54
32
1
0
EXTRAM
AO
AUXR.1
EXTRAM
AUXR.0
AO
See more detailed description in Figure 32.
Dual DPTR
The dual DPTR structure (see Figure 18) 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.
New Register Name: AUXR1#
SFR Address: A2H
Reset Value: xxxxxxx0B
AUXR1 (A2H)
7
6
5
43210
GF2
0
DPS
Where:
DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1.
Select Reg
DPS
DPTR0
0
DPTR1
1
The DPS bit status should be saved by software when switching
between DPTR0 and DPTR1.
The GF2 bit is a general purpose user-defined flag. 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 GF2 bit.
DPS
DPTR1
DPTR0
DPH
(83H)
DPL
(82H)
EXTERNAL
DATA
MEMORY
SU00745A
BIT0
AUXR1
Figure 18.
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 DPTR
Increments the data pointer by 1
MOV DPTR, #data16
Loads the DPTR with a 16-bit constant
MOV A, @ A+DPTR
Move code byte relative to DPTR to ACC
MOVX A, @ DPTR
Move external RAM (16-bit address) to
ACC
MOVX @ DPTR , A
Move ACC to external RAM (16-bit
address)
JMP @ A + DPTR
Jump indirect relative to 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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