HT45R22E Holtek Semiconductor, HT45R22E Datasheet - Page 41

• Manufacturer Part Number: HT45R22E
• Description: Remote Type 8-bit OTP MCU
• Manufacturer: Holtek Semiconductor

Time Base
The device includes a Time Base function which is used
to generate a regular time interval signal.
The Time Base time interval magnitude is determined
using an internal 13 stage counter sets the division ratio
of the clock source. This division ratio is controlled by
both the TBSEL0 and TBSEL1 bits in the CTRL1 regis-
ter. The clock source is selected using the T0S bit in the
TMR0C register.
When the Time Base time out, a Time Base interrupt sig-
nal will be generated. It should be noted that as the Time
Base clock source is the same as the Timer/Event
Counter clock source, care should be taken when pro-
gramming.
Rev. 1.00
Timer Programming Example
org 04h
org 08h
jmp tmr0int
:
org 20h
:
;internal Timer 0 interrupt routine
tmr0int:
:
; Timer 0 main program placed here
:
:
begin:
;setup Timer 0 registers
mov
mov tmr0,a
mov a,081h
mov tmr0c,a
;setup interrupt register
mov a,00dh
mov intc0,a
:
set tmr0c.4
:
:
:
:
:
a,09bh
; external interrupt vector
; Timer Counter 0 interrupt vector
; jump here when Timer 0 overflows
; main program
; setup Timer 0 preload value
; setup Timer 0 control register
; timer mode and prescaler set to /2
; enable master interrupt and both timer interrupts
; start Timer 0
41
Operational Amplifiers
There are two fully integrated Operational Amplifiers in
the device, OPA0 and OPA1. These OPAs can be used
for user specified analog signal processing. The OPAs
can be disabled or enabled entirely under software con-
trol using internal registers. With specific control regis-
ters, some OPA related applications can be easily
implemented, such as Unity Gain Buffer, Non-Inverting
Amplifier, Inverting Amplifier and various kinds of filters,
etc.
Comparator & Operational Amplifier Registers
The internal Operational Amplifiers are fully under the
control of internal registers, COPA0C, COPA1C,
COPA2C, COPA3C, OPA0OC and OPA1OC. These
control the enable/disable function, input path selection,
gain control, polarity and calibration function.
HT45R22E
March 17, 2010
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