8051 Family: Difference between revisions

Latest revision as of 18:47, 25 August 2008

The Intel 8051 is a single chip microcontroller which was developed by Intel in 1980 for use in embedded systems. It has become very popular in the 80s, but today many manufacturers propose enhanced versions that are 8051-compatible.

Architecture

Speed

Name	Clock freq.	clock / instr. cycle(*)
Standard 8051	12MHz 16MHz 20MHz 24MHz	12
NXP P89V66x NXP P89CV51Rx2	0MHz..40MHz	12
NXP P89V66x NXP P89CV51Rx2	20MHz	6
NXP P8xC660X2/661X2 NXP P87C51RX2	0MHz..33MHz	12
NXP P8xC660X2/661X2 NXP P87C51RX2	0MHz..30MHz	6
NXP LPC938	12MHz 18MHz	2

(*) # clock oscillation periods / instruction cycle.

Expanded RAM

Intel 8XC51RA series uses a trick called Expanded RAM to allow accessing 512 byte of on-chip RAM memory. See 8XC51RA/RB/RC Hardware Description for detailed information.

In summary, there are 4 RAM memory segments:

Lower 128 bytes of RAM	00h..7Fh	DIRECT	INDIRECT
Upper 128 bytes of RAM	80h..FFh		INDIRECT
Special Function Registers (SFR)	80h..FFh	DIRECT
256-byte expanded RAM (ERAM)	00h..FFh			`MOVX @R0` `MOVX @R1` `MOVX @DPTR` (EXTRAM=0)

Links

The 8051 on Wikipedia.
My links on Del.icio.us.
A website on 8051/8052 controllers [1].

Intel

Documentation page.
MCS 51 core
- MCS 51 Microcontroller Family User's Manual
MCS 51/251 - Classic
- 128 byte on-chip data RAM
- Main page
- 87C51/80C51BH/80C31BH Commercial/Express version
- 80C31BH/80C51BH/87C51 Automotive version
MCS 51/251 - Expanded RAM
- 512 byte on-chip data RAM
- Main page
- Datasheet - 8XC51RA/RB/RC CHMOS Single-Chip 8-Bit Microcontrollers
- Datasheet - 8XC51RX Specification Update
- 8XC51RA/RB/RC Hardware Description

NXP

NXP (ex. Philips Semiconductors) offers a wide range of 8051-compatible controllers:

80C51 main product page
- 80C51 product parametric filter
- 80C51 support documents

LPC900 family
- Datasheet - 2-clock controller LPC938

Microcontrollers support page
- Microcontrollers support documents
- Microcontrollers FAQ

Some more links:

@@ Line 1: / Line 1: @@
-The '''Intel 8051''' is a single chip microcontroller which was developed by Intel in 1980 for use in embedded systems. It has become very popular in the 80s, but today many manufacturer proposes enhanced version that are 8051-compatible.
+The '''Intel 8051''' is a single chip microcontroller which was developed by Intel in 1980 for use in embedded systems. It has become very popular in the 80s, but today many manufacturers propose enhanced versions that are 8051-compatible.
 ==Architecture==
 === Speed ===
-* '''Standard 8051''':
+{| border="1" cellpadding="5" cellspacing="0" style="text-align:center"
-** Supported clock frequencies: 12MHz, 16MHz, 20MHz, and 24MHz.
+|-
-** Clock cycles per instructions: 12 (ie. all instructions takes a multiple of 12 oscillation periods).
+! align="left" | Name || Clock freq. || clock / instr. cycle(*)
-* '''Optimized 8051''' (source: NXP):
+|-
-** Supported clock frequencies: from 7MHz to 40MHz.
+| align="left" | '''Standard 8051'''
-** Clock cycles per instructions: 2 (LPC900 family), 6 (LPC700 and 80C51 family), 12(80C51).
+| 12MHz<br>16MHz<br>20MHz<br>24MHz
+| 12
+|-
+| align="left" rowspan="2" | '''NXP P89V66x'''<br>'''NXP P89CV51Rx2'''
+| 0MHz..40MHz
+| 12
+|-
+| 20MHz
+| 6
+|-
+| align="left" rowspan="2" | '''NXP P8xC660X2/661X2'''<br>'''NXP P87C51RX2'''
+| 0MHz..33MHz
+| 12
+|-
+| 0MHz..30MHz
+| 6
+|-
+| align="left" | '''NXP LPC938'''
+| 12MHz<br>18MHz
+| 2
+|}
+(*) # clock oscillation periods / instruction cycle.
+=== Expanded RAM ===
+Intel 8XC51RA series uses a trick called ''Expanded RAM'' to allow accessing 512 byte of on-chip RAM memory. See [http://download.intel.com/design/MCS51/MANUALS/27266801.pdf 8XC51RA/RB/RC Hardware Description] for detailed information.
+In summary, there are 4 RAM memory segments:
+{| border="1" cellpadding="5" cellspacing="0" style="text-align:center"
+|-
+| align="left" | Lower 128 bytes of RAM
+| 00h..7Fh
+| DIRECT
+| INDIRECT
+|
+|-
+| align="left" | Upper 128 bytes of RAM
+| 80h..FFh
+|
+| INDIRECT
+|
+|-
+| align="left" | Special Function Registers (SFR)
+| 80h..FFh
+| DIRECT
+|
+|
+|-
+| align="left" | 256-byte expanded RAM (ERAM)
+| 00h..FFh
+|
+|
+| <tt>MOVX @R0</tt><br><tt>MOVX @R1</tt><br><tt>MOVX @DPTR</tt><br>(EXTRAM=0)
+|}
 == Links ==
@@ Line 21: / Line 74: @@
 * MCS 51/251 - Classic
 ** 128 byte on-chip data RAM
+** [http://www.intel.com/design/mcs51/cf_51.htm Main page]
 ** [http://download.intel.com/design/mcs51/datashts/27233504.pdf 87C51/80C51BH/80C31BH Commercial/Express version]
 ** [http://download.intel.com/design/MCS51/datashts/27041908.pdf 80C31BH/80C51BH/87C51 Automotive version]
 * MCS 51/251 - Expanded RAM
-** [http://www.intel.com/design/mcs51/er_51.htm Main page]
 ** 512 byte on-chip data RAM
+** [http://www.intel.com/design/mcs51/er_51.htm Main page]
 ** [http://download.intel.com/design/mcs51/datashts/27265903.pdf Datasheet - 8XC51RA/RB/RC CHMOS Single-Chip 8-Bit Microcontrollers]
 ** [http://download.intel.com/design/mcs51/SPECUPDT/27288501.pdf Datasheet - 8XC51RX Specification Update]
@@ Line 37: / Line 91: @@
 ** [http://www.standardics.nxp.com/products/mcus/80c51/ 80C51 product parametric filter]
 ** [http://www.standardics.nxp.com/support/documents/microcontrollers/?scope=80C51 80C51 support documents]
+* LPC900 family
+** [http://www.standardics.nxp.com/products/lpc900/datasheet/p89lpc938.pdf Datasheet - 2-clock controller LPC938]
 * [http://www.standardics.nxp.com/support/microcontrollers/ Microcontrollers support page]

8051 Family: Difference between revisions

Latest revision as of 18:47, 25 August 2008

Contents

Architecture

Speed

Expanded RAM

Links

Intel

NXP

Navigation menu

8051 Family: Difference between revisions

Latest revision as of 18:47, 25 August 2008

Architecture

Speed

Expanded RAM

Links

Intel

NXP

Navigation menu

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