AIM: a) Mask the lower nibble of an 8-bit number. b) Mask the higher nibble of an 8-bit number.
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Write initialisation instructions for the 8255A to set up: PORT A as an output port in Mode 0 PORT B as an output port in Mode 1 for interrupt I/O PORT C (Upper) as an output port in Mode 0.
Find the values of CS,A1,A0 in 8255 for the following cases: Port A selection Port B selection Port C selection Control Register selection
Write initialisation instructions for the 8255A to set up: PORT A as an output port in Mode 0 PORT B as an output port in Mode 1 for interrupt I/O PORT C (Upper) as an output port in Mode 0.
Q1) Elaborate the usage of following registers in 8259 Interrupt Request Register (IRR) In-Service Register (ISR) Priority Resolver Interrupt Mask Register (IMR) Control Logic Section Q2) Write down the mode 0 control words of 8255 for the following two cases: (a) Port A = ...
AIM : a) Shift a 16 -bit number to left by1-bit b)Shift a 16-bit number to left by2-bits.