"@:"A:I~I
Entry Point: WBOOT + 54H
This
is
not
supported.
It
will simply RETURN.
MASKI
is
the entry point for the subroutine which sets and resets interrupt
masks.
Entry Point: WBOOT
+ 57H
Entry parameters
Register B =
OOH
Interrupt disable
B = 01H Interrupt enable
B
~
2 Interrupt enable register (IER) read
Register C Bit 0 -
7508
C Bit 1 -
8251
C Bit 2 - DCD
C Bit 3 - ICF
C Bit 4 - OVF
C Bit 5 - EXT
Return Parameters
(RS-232C carrier detect)
(Input capture flag)
(Timer overflow)
(Interrupt from system bus)
Register A = Contents
of
IER register (110
port
4)
ADCVRT is the entry point for the subroutine which reads the
AID
converter
input, Bar Code reader,
DIP
switch settings, battery voltage, or power switch
status.
Entry Point: WBOOT
+ 6F
Entry parameters
RegisterC =
OOH
-
AID
channel 1 (input from the analog jack)
RegisterC = 01H -
AID
channel 2 (input from the bar code reader con-
nector)
RegisterC=02H -
DIP
SWI
RegisterC = 03H - Battery voltage
RegisterC = 04H - Power switch status (TRIG status
of
the analog con-
nector)
5-34
When any other value is set in register C, the routine returns without doing
anything.
Return Parameters
When Register C contains
OOH
or
01H on calling ADCVRT
Register A contains
AID
converter
data
in the 6 MSB as follows:
Bit
7 6
5 4 3
2 1 0
Data
MSB
LSB
Bits 2
to
7 will all be 1
if
the input voltage
is
greater
than
2.0 V.
If
the input
voltage
is
negative, bits 2
to
7 will all be
o.
When Register C contains 2
on
calling ADCVRT
Register A contains contains the Switch information as follows.
Bit
7 6 5
4 3
2 1 0
SW 8
7 6 5
4 3
2 1
When Register C contains 3
on
calling ADCVRT
Register A contains data from the
AID
converter
Full scale = 5.7 V
When register C contains 4
on
calling ADCVRT
Register A, bit 0 = 1 - Power switch ON
Register A, bit 0 = 0 - Power switch OFF
Register A, bit 1 = 1 -
TRIG
ON
Register A, bit 1 = 0 -
TRIG
OFF
5-35
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