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| 型號(hào)： | MQ80C52CXXX-36SCD |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁(yè)數(shù)： | 126/182頁(yè) |
| 文件大?。?/td> | 2994K |
| 代理商： | MQ80C52CXXX-36SCD |
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48
1477K–AVR–08/10
ATtiny26(L)
MCU Control Register
– MCUCR
The MCU Control Register contains control bits for general MCU functions.
Bit 6 – PUD: Pull-up Disable
When this bit is set (one), the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See “Con-
figuring the Pin” on page 42 for more details about this feature.
Alternate Functions of
Port A
Port A has an alternate functions as analog inputs for the ADC and Analog Comparator and pin
change interrupt as shown in Table 23. If some Port A pins are configured as outputs, it is
essential that these do not switch when a conversion is in progress. This might corrupt the result
of the conversion. The ADC is described in “Analog to Digital Converter” on page 94. Analog
Comparator is described in “Analog Comparator” on page 91. Pin change interrupt triggers on
pins PA7, PA6 and PA3 if interrupt is enabled and it is not masked by the alternate functions
even if the pin is configured as an output. See details from “Pin Change Interrupt” on page 62.
Figure 35 on page 46. Thera are changes on PA7, PA6, and PA3 digital inputs. PA3 output and
pullup driver are also overridden.
ADC6/AIN1 Port – A, Bit 7
AIN1: Analog Comparator Negative input and ADC6: ADC input channel 6. Configure the port
pin as input with the internal pull-up switched off to avoid the digital port function from interfering
with the function of the analog comparator or analog to digital converter.
PCINT1: Pin Change Interrupt 1 pin. Pin change interrupt is enabled on pin when global interrupt
is enabled, pin change interrupt is enabled and the alternate function do not mask the interrupt.
The masking alternate function is the Analog Comparator. Digital input is enabled on pin PA7
also in SLEEP modes, if the pin change interrupt is enabled and not masked by the alternate
function.
ADC5/AIN0 Port – A, Bit 6
Bit
765
4321
0
–PUD
SE
SM1
SM0
–
ISC01
ISC00
MCUCR
Read/Write
R
R/W
R
R/W
Initial Value
000
0000
0
Table 23. Port A Pins Alternate Functions
Port Pin
Alternate Function
PA7
ADC6 (ADC input channel 6)
AIN1 (Analog Comparator negative input)
PCINT1 (Pin Change Interrupt 1)
PA6
ADC5 (ADC input channel 5)
AIN0 (Analog Comparator positive input)
PCINT1 (Pin Change Interrupt 1)
PA5
ADC4 (ADC input channel 4)
PA4
ADC3 (ADC input channel 3)
PA3
AREF (ADC external reference)
PCINT1 (Pin Change Interrupt 1)
PA2
ADC2 (ADC input channel 2)
PA1
ADC1 (ADC input channel 1)
PA0
ADC0 (ADC input channel 0)
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