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AT83C5111 데이터시트(PDF) 10 Page - ATMEL Corporation

부품명 AT83C5111
상세설명  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5111 데이터시트(HTML) 10 Page - ATMEL Corporation

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AT8xC5111
4190A–8051–11/02
Timer 0: Clock Inputs
The SCLKT0 bit in OSCCON register allows to select Timer 0 Subsidiary clock. This
allows to perform a Real-Time Clock function.
SCLKT0 = 0: Timer 0 uses the standard T0 pin as clock input (Standard mode).
SCLKT0 = 1: Timer 0 uses the special Sub Clock as clock input.
When the subclock input is selected for Timer 0 and the crystal oscillator is selected for
CPU and peripherals, the CKRL prescaler must be set to FF (division factor 2) in order
to assure a proper count on Timer 0.
With an external a 32 kHz oscillator, the timer interrupt can be set from 1/256 to 256
seconds to perform a Real-Time Clock (RTC) function. The power consumption will be
very low as the CPU is in idle mode at 32 kHz most of the time. When more CPU power
is needed, the internal RC oscillator is activated and used by the CPU and the others
peripherals.
Registers
Clock Control Register
The clock control register is used to define the clock system behavior.
Table 2. OSCCON - Clock Control Register (8Fh)
SCLKT0
1
0
CkIdle
: 6
T0 pin
Sub Clock
C/T
1
0
OSCCON
TMOD
Gate
INT0
TR0
Timer 0
Control
765
43210
-----
SCLKT0
OSCBEN
OSCAEN
Bit
Number
Bit
Mnemonic
Description
7-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3-
Reserved
The value read from this bit is indeterminate. Do not set this bit.



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