Digital Electronics - The 8051 Microcontroller - Discussion
Discussion Forum : The 8051 Microcontroller - General Questions (Q.No. 13)
13.
When the 8051 is reset and the 
line is HIGH, the program counter points to the first program instruction in the:
line is HIGH, the program counter points to the first program instruction in the:Discussion:
12 comments Page 2 of 2.
Amisha. Patil said:
4 years ago
EA is high (connect to vcc) program fetches to address 0000H to 0FFFH are connected to internal ROM & program fetches to address 1000H through FFFFH are directed to external ROM.
EA pin low all address fetches by the program are directed to the external ROM.
EA pin low all address fetches by the program are directed to the external ROM.
Gopinadh yedula said:
3 years ago
1) If EA is acting high means we are using internal memory.
2) If EA is low -we are indicating the controller to use external rom.
2) If EA is low -we are indicating the controller to use external rom.
(1)
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