P89V51RB2BBC,557 NXP Semiconductors, P89V51RB2BBC,557 Datasheet - Page 19

• Manufacturer Part Number: P89V51RB2BBC,557
• Description: IC 80C51 MCU 1024 RAM 44TQFP
• Manufacturer: NXP Semiconductors
• Series: 89Vr

Specifications of P89V51RB2BBC,557

• Program Memory Type: FLASH
• Program Memory Size: 16KB (16K x 8)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Processor Series: P89V5x
• Core: 80C51
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI, UART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 622-1017 - BOARD 44-ZIF PLCC SOCKET
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935277723557; P89V51RB2BBC; P89V51RB2BBC

NXP Semiconductors
P89V51RB2_RC2_RD2_5
Product data sheet
6.2.8 Dual data pointers
The device has two 16-bit data pointers. The DPTR Select (DPS) bit in AUXR1
determines which of the two data pointers is accessed. When DPS = 0, DPTR0 is
selected; when DPS = 1, DPTR1 is selected. Quickly switching between the two data
pointers can be accomplished by a single INC instruction on AUXR1 (see
Fig 6. Internal and external data memory structure
2FFH
000H
2FFH
000H
EXPANDED RAM
ADDRESSING)
EXPANDED
(INDIRECT
768 B
Rev. 05 — 12 November 2009
RAM
FFFFH
0300H
FFH
7FH
80H
00H
INTERNAL RAM
INTERNAL RAM
(INDIRECT AND
ADDRESSING)
ADDRESSING)
ADDRESSING)
LOWER 128 B
UPPER 128 B
EXTRAM = 0
EXTERNAL
P89V51RB2/RC2/RD2
(INDIRECT
(INDIRECT
MEMORY
DIRECT
DATA
8-bit microcontrollers with 80C51 core
FFFFH
0000H
FFH
80H
REGISTERS (SFRs)
ADDRESSING)
ADDRESSING)
EXTERNAL
FUNCTION
(INDIRECT
EXTRAM = 1
MEMORY
SPECIAL
(DIRECT
DATA
© NXP B.V. 2009. All rights reserved.
Figure
002aaa517
7).
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