參數(shù)資料
型號(hào)： MR80C52TXXX-16SHXXX:RD
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
文件頁(yè)數(shù)： 312/586頁(yè)
文件大?。?/td> 25028K
38
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
9.8
External clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
9-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 9-4.
External clock drive configuration.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. If changes of more than 2% is
required, ensure that the MCU is kept in Reset during the changes.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to ”System Clock Prescaler” on page
39 for details.
Table 9-14.
Crystal oscillator clock frequency.
Nominal frequency
CKSEL3..0
0 - 20MHz
0000
Table 9-15.
Start-up rimes for the external clock selection.
Power conditions
Start-up time from power-
down and power-save
Additional delay from
reset (VCC = 5.0V)
SUT1..0
BOD enabled
6CK
14CK
00
Fast rising power
6CK
14CK + 4.1ms
01
Slowly rising power
6CK
14CK + 65ms
10
Reserved
11
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
相關(guān)PDF資料
PDF描述
MR80C52TXXX-20/883 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
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