AT89C51RE2-SLSUM Atmel, AT89C51RE2-SLSUM Datasheet - Page 25
![MCU 8BIT FLASH 2.7-5.5V 44-PLCC](/photos/6/70/67043/453-44-plcc_sml.jpg)
AT89C51RE2-SLSUM
Manufacturer Part Number
AT89C51RE2-SLSUM
Description
MCU 8BIT FLASH 2.7-5.5V 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51RE2-SLSUM.pdf
(187 pages)
Specifications of AT89C51RE2-SLSUM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Package
44PLCC
Device Core
8051
Family Name
89C
Maximum Speed
40 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
34
Interface Type
SPI/TWI/UART
Number Of Timers
3
Processor Series
AT89x
Core
8051
Data Ram Size
8 KB
Maximum Clock Frequency
40 MHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89OCD-01
Minimum Operating Temperature
- 40 C
Cpu Family
89C
Device Core Size
8b
Frequency (max)
40MHz
Total Internal Ram Size
8KB
# I/os (max)
34
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PLCC
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51RE2-SLSUM
Manufacturer:
HONEYWELL
Quantity:
101
Extended Stack
7663E–8051–10/08
FFFFh
0000h
Logical MCU
Address
Standard C51 Stack mode EES = 0
FFh
00h
256 bytes
IRAM
XRAM
SP Value
FFh
00h
The lowest bytes of the XRAM may be used to allow extension of the stack pointer.
The extended stack allows to extend the standard C51 stack over the 256 bytes of internal RAM.
When the extended stack mode is activated (EES bit in AUXR1), the stack pointer (SP) can
grow in the lower 256 bytes of the XRAM area.
The stack extension consists in a 9 bits stack pointer where the ninth bit is located in SP9 (bit 6
of AUXR1). The SP9 then indicates if the stack pointer belongs to the internal RAM (SP9
cleared) or to the XRAM memory (SP9 set).
To ensure backward compatibility with standard C51 architecture, the extended mode is disable
at chip reset.
Figure 7. Stack modes
Figure 8. AUXR1 register
AUXR1- Auxiliary Register 1(0A2h)
Number
256 SP values
rollover within 256B of IRAM
EES
Bit
7
7
Mnemonic
SP9
EES
Bit
6
Description
Enable Extended Stack
Set to enable the extended stack
Clear to disable the extended stack (default value)
U2
5
This bit allows the selection of the stack extended mode.
FFFFh
00FFh
0000h
Logical MCU
Address
FFh
00h
Extended Stack mode Stack EES = 1
4
-
256 bytes
IRAM
XRAM
GF2
3
SP Value
FFh
FFh
00h
00h
SP9=1
SP9=0
2
0
AT89C51RE2
512 SP Values
rollover in:
256B of IRAM
+
lower 256B of XRAM
1
-
DPS
0
25