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AT90S4433 Datasheet(PDF) 40 Page - ATMEL Corporation

Part No. AT90S4433
Description  8-Bit AVR Microcontroller with 4K Bytes of In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S4433 Datasheet(HTML) 40 Page - ATMEL Corporation

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AT90S/LS4433
1042H–AVR–04/03
the TEMP Register. Consequently, the Low Byte TCNT1L must be accessed first for a
full 16-bit register read operation.
The Timer/Counter1 is realized as an up or up/down (in PWM mode) counter with read
and write access. If Timer/Counter1 is written to and a clock source is selected, the
Timer/Counter1 continues counting in the timer clock cycle after it is preset with the writ-
ten value.
Timer/Counter1 Output
Compare Register – OCR1H
and OCR1L
The Output Compare Register is a 16-bit read/write register.
The Timer/Counter1 Output Compare Register contains the data to be continuously
compared with Timer/Counter1. Actions on compare matches are specified in the
Timer/Counter1 Control and Status Register.
Since the Output Compare Register (OCR1) is a 16-bit register, a temporary register
TEMP is used when OCR1 is written to ensure that both bytes are updated simulta-
neously. When the CPU writes the High Byte, OCR1H, the data is temporarily stored in
the TEMP Register. When the CPU writes the Low Byte, OCR1L, the TEMP Register is
simultaneously written to OCR1H. Consequently, the High Byte OCR1H must be written
first for a full 16-bit register write operation.
The TEMP Register is also used when accessing TCNT1 and ICR1. If the main program
and interrupt routines perform access to registers using TEMP, interrupts must be dis-
abled during access from the main program.
Bit
15141312
11
10
9
8
$2B ($4B)
MSB
OCR1H
$2A ($4A)
LSB
OCR1L
76
543
210
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/WR/W
R/WR/W
R/WR/W
R/WR/W
Initial Value
0
0
0
0
0
0
0
0
00
000
000


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