P89LPC972FDH,129 NXP Semiconductors, P89LPC972FDH,129 Datasheet - Page 22

• Manufacturer Part Number: P89LPC972FDH,129
• Description: MCU 80C51 8KB FLASH 20TSSOP
• Manufacturer: NXP Semiconductors
• Series: LPC900r

Specifications of P89LPC972FDH,129

• Program Memory Type: FLASH
• Program Memory Size: 8KB (8K x 8)
• Package / Case: 20-TSSOP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 18MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 18
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: P89LPC
• Core: 80C51
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 18 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 5
• Operating Supply Voltage: 2.4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935290299129

NXP Semiconductors
P89LPC97X
Product data sheet
7.13 Memory organization
7.14 Data RAM arrangement
7.15 Interrupts
The various P89LPC970/971/972 memory spaces are as follows:
The 768 bytes of on-chip RAM are organized as shown in
Table 6.
The P89LPC970/971/972 uses a four priority level interrupt structure. This allows great
flexibility in controlling the handling of the many interrupt sources. The
P89LPC970/971/972 supports 15 interrupt sources: external interrupts 0 and 1, Timers 0
and 1, Timer 2/3/4, serial port TX, serial port RX, combined serial port RX/TX, brownout
detect, watchdog/RTC, I
Each interrupt source can be individually enabled or disabled by setting or clearing a bit in
the interrupt enable registers IEN0 or IEN1. The IEN0 register also contains a global
disable bit, EA, which disables all interrupts.
Each interrupt source can be individually programmed to one of four priority levels by
setting or clearing bits in the interrupt priority registers IP0, IP0H, IP1 and IP1H. An
interrupt service routine in progress can be interrupted by a higher priority interrupt, but
Type
DATA
IDATA
XDATA
•
•
•
•
•
DATA
128 bytes of internal data memory space (00H:7FH) accessed via direct or indirect
addressing, using instructions other than MOVX and MOVC. All or part of the Stack
may be in this area.
IDATA
Indirect Data. 256 bytes of internal data memory space (00H:FFH) accessed via
indirect addressing using instructions other than MOVX and MOVC. All or part of the
Stack may be in this area. This area includes the DATA area and the 128 bytes
immediately above it.
SFR
Special Function Registers. Selected CPU registers and peripheral control and status
registers, accessible only via direct addressing.
XDATA
‘External’ Data or Auxiliary RAM. Duplicates the classic 80C51 64 kB memory space
addressed via the MOVX instruction using the DPTR, R0, or R1. All or part of this
space could be implemented on-chip.
CODE
64 kB of Code memory space, accessed as part of program execution and via the
MOVC instruction. The P89LPC970/971/972 has 4 kB/8 kB of on-chip Code memory.
On-chip data memory usages
Data RAM
Memory that can be addressed directly and indirectly
Memory that can be addressed indirectly
Auxiliary (External Data) on-chip memory that is accessed
using the MOVX instructions
All information provided in this document is subject to legal disclaimers.
2
Rev. 3 — 8 June 2010
C-bus, keyboard, comparators 1 and 2, SPI.
8-bit microcontroller with accelerated two-clock 80C51 core
P89LPC970/971/972
Table
6.
© NXP B.V. 2010. All rights reserved.
Size (bytes)
128
256
256
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