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HT56R22 Datasheet(PDF) 91 Page - Holtek Semiconductor Inc

Part # HT56R22
Description  TinyPowerTM A/D Type 8-Bit OTP MCU with DAC
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56R22 Datasheet(HTML) 91 Page - Holtek Semiconductor Inc

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HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Rev. 1.30
91
December 26, 2014
Multi-function Interrupt
Within these devices there is a Multi-function interrupt.
Unlike the other independent interrupts, these inter-
rupts have no independent source, but rather are
formed from other existing interrupt sources.
A Multi-function interrupt request will take place when
the Multi-function interrupt request flag, MFF is set.
The Multi-function interrupt flag will be set when any of
their included functions generate an interrupt request
flag. To allow the program to branch to its respective in-
terrupt vector address, when the Multi-function inter-
rupt is enabled and the stack is not full, and either one of
the interrupts contained the Multi-function interrupt oc-
curs, a subroutine call to the Multi-function interrupt vec-
tor will take place. When the interrupt is serviced, the
Multi-Function request flag, will be automatically reset
and the EMI bit will be automatically cleared to disable
other interrupts.
However,
it
must
be
noted
that,
although
the
Multi-function Interrupt flag will be automatically reset
when the interrupt is serviced, the request flag from the
original source of the Multi-function interrupt, will not be
automatically reset and must be manually reset by the
application program.
Programming Considerations
By disabling the interrupt enable bits, a requested inter-
rupt can be prevented from being serviced, however,
once an interrupt request flag is set, it will remain in this
condition in the interrupt register until the corresponding
interrupt is serviced or until the request flag is cleared by
a software instruction.
It is recommended that programs do not use the
²CALL
subroutine
² instruction within the interrupt subroutine.
Interrupts often occur in an unpredictable manner or
need to be serviced immediately in some applications. If
only one stack is left and the interrupt is not well con-
trolled, the original control sequence will be damaged
once a
²CALL subroutine² is executed in the interrupt
subroutine.
All of these interrupts have the capability of waking up
the processor when in the Idle/Sleep Mode.
Only the Program Counter is pushed onto the stack. If
the contents of the register or status register are altered
by the interrupt service program, which may corrupt the
desired control sequence, then the contents should be
saved in advance.
LCD SCOM Function
The devices have the capability of driving external LCD
panels. The common pins for LCD driving, SCOM0~
SCOM3, are pin shared with certain pin on the PB0~
PB3 port. The LCD signals (COM and SEG) are gener-
ated using the application program.
LCD Operation
An external LCD panel can be driven using this device
by configuring the PB0~PB3 pins as common pins and
using other output ports lines as segment pins. The LCD
driver function is controlled using the SCOMC register
which in addition to controlling the overall on/off function
also controls the bias voltage setup function. This en-
ables the LCD COM driver to generate the necessary
VDD/2 voltage levels for LCD 1/2 bias operation.
The SCOMEN bit in the SCOMC register is the overall
master control for the LCD Driver, however this bit is
used in conjunction with the COMnEN bits to select
which Port B pins are used for LCD driving. Note that the
Port Control register does not need to first setup the pins
as outputs to enable the LCD driver operation.
SCOMEN
COMnEN
Pin Function
O/P Level
0
X
I/O
0or1
1
0
I/O
0or1
1
1
SCOMN
VDD/2
Output Control
V D D
S C O M 0 ~
S C O M 3
S C O M E N
C O M n E N
V D D / 2
S C O M o p e r a t i n g c u r r e n t
LCD COM Bias


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