P89V51RD2 microcontroller moving LED display using Buffer 74LS245 and 74HC595

Hi, There are 4 Columns and 16 Rows of LED Matrix. I have circuit with Philips microcontroller with Port0 and Port1 connected to ULN2003 to Rows of the LED Matrix. While Port 2.2 to Port 2.7...
P89V51RD2 microcontroller moving LED display using Buffer 74LS245 and 74HC595

Hi, There are 4 Columns and 16 Rows of LED Matrix. I have circuit with Philips microcontroller with Port0 and Port1 connected to ULN2003 to Rows of the LED Matrix. While Port 2.2 to Port 2.7...
ARM shifting instruction with register shift length

Note: This was originally posted on 26th October 2009 at http://forums.arm.com Hi, For fun, I'm trying to write RTL for my own processor implementing the ARM v4 ISA. I have a question regarding the ARM...
ARM shifting instruction with register shift length

Note: This was originally posted on 26th October 2009 at http://forums.arm.com Hi, For fun, I'm trying to write RTL for my own processor implementing the ARM v4 ISA. I have a question regarding the ARM...
SBUF physically two registers? and shift register

My first question is regarding SBUF register of 8051. How come it is two registers while locations is only one i.e; 99H. we call SBUF physically two registers (write only and read only two separate distinct...