Texas Instruments MSP50C614 manual Iprtc

Implementation Details

_iprtc
in	a0, 0x10	; read from PortC
ret
_iprtd
in	a0, 0x18	; read from PortD
ret
_iprte
in	a0, 0x20	; read from PortE
ret
_iprtf
in	a0, 0x28	; read from PortF
ret
_in_port_access		; table for table lookup
DATA	_iprta
DATA	_iprtb
DATA	_iprtc
DATA	_iprtd
DATA	_iprte
DATA	_iprtf

;±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±

;±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±

;called from C±±

;void cport(char Port, int Control)

;Writes Control bits for the I/O port specified by the letter Port.

;Example:

;cport('B', 0xFF); //Configure all bits of Port B as output ;±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±

_cport

mov	a0, *r7 ± 4 ; port address
mov	a0~, *r7 ± 2	; data
add	a0, _cont_port_access ± 'A' ; find the location in the table
mov	a0, *a0	; get the value of the label in the table
jmp	*a0	; jump to the label from the table
_cprta
out	0x04, a0~	; write to PortA control
ret
_cprtb
out	0x0C, a0~	; write to PortB control
ret
_cprtc
out	0x14, a0~	; write to PortC control
ret
_cprtd
out	0x1C, a0~	; write to PortD control
ret
_cprte
out	0x24, a0~	; write to PortE control
ret
_cont_port_access		; table for table lookup
DATA	_cprta
DATA	_cprtb
DATA	_cprtc
DATA	_cprtd

5-62