Hi,
Beginner mode  :)

Could someone explain the use for the TRIS (TRISTATE) register in a C54?

In particular:


MOVLW   0x0F    ; load the working register 'W' with the control code for
                ; the data direction register, in this case the HEX
                ; number 0F to set the port as inputs
TRIS    5       ; set the data control register for register 5 which is
                ; port A by moving the data in W to the data control
                ; register for the port

In the PIC16C54 datasheet I find the TRIS operand means:

Description: TRIS register 'f' (f=5,6 or 7) is loaded with the contents of
the W register.

is the TRIS register PORT A? i understand moving the data (MOVLW 0x0F)

if it set the data control register for register 6, would that be PORT B?

i think its just the wording of the comment that is confusing me.

thanks in advance,

bernard
--
Bernard Tyers*Dept. of Physical Sciences*Dublin City
University*P:01.7005273*L:N117*W:frank.physics.dcu.ie/~bty

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