AT89C51RB2-RLTCM ATMEL [ATMEL Corporation], AT89C51RB2-RLTCM Datasheet - Page 11
AT89C51RB2-RLTCM
Manufacturer Part Number
AT89C51RB2-RLTCM
Description
8-bit Microcontroller with 16K/ 32K Bytes Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT89C51RB2-RLTCM.pdf
(125 pages)
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Table 12. Pin Description for 40 - 44 Pin Packages (Continued)
4180B–8051–04/03
Mnemonic
PSEN
EA
DIL
29
31
Pin Number
LCC
32
35
VQFP44 1.4
26
29
Type
O
I
Name and Function
Program Strobe Enable: The read strobe to external program memory. When
executing code from the external program memory, PSEN is activated twice each
machine cycle, except that two PSEN activations are skipped during each access to
external data memory. PSEN is not activated during fetches from internal program
memory.
External Access Enable: EA must be externally held low to enable the device to
fetch code from external program memory locations 0000H to FFFFH (RD). If
security level 1 is programmed, EA will be internally latched on Reset.
AT89C51RB2/RC2
11
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