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T83C5102XXX-ICFCL Datasheet(PDF) 9 Page - ATMEL Corporation

Part # T83C5102XXX-ICFCL
Description  8-bit Low Pin Count Microcontrollers
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T83C5102XXX-ICFCL Datasheet(HTML) 9 Page - ATMEL Corporation

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9
T8xC5101/02
4233G–8051–03/03
Figure 2. Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 2.) allows to switch from 12 clock cycles
per instruction to 6 clock cycles and vice versa. At reset, the standard speed is activated
(STD mode). Setting this bit activates the X2 feature (X2 mode).
CAUTION
In order to prevent any incorrect operation while operating in X2 mode, user must be
aware that all peripherals using clock frequency as time reference (UART, timers,
PCA...) will have their time reference divided by two. For example a free running timer
generating an interrupt every 20 ms will then generate an interrupt every 10 ms. UART
with 4800 baud rate will have 9600 baud rate.
Table 2. CKCON Register
CKCON - Clock Control Register (8Fh)
Reset Value = XXXX XXX0b
Not bit addressable
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
STD Mode
7654
3210
-------
X2
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.
2-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0X2
CPU and peripheral clock bit
Clear to select 12 clock periods per machine cycle (STD mode,
F
OSC=FXTAL/2).
Set to select 6 clock periods per machine cycle (X2 mode, FOSC=FXTAL).


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