參數(shù)資料
型號： MC80C52XXX-25/883
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40
文件頁數(shù)： 61/83頁
文件大小： 8336K
代理商： MC80C52XXX-25/883
74
7707F–AVR–11/10
AT90USB82/162
Bit 4 – PUD: Pull-up Disable
When this bit is written to 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 68 for more details about this feature.
11.3.2
Alternate Functions of Port B
The Port B pins with alternate functions are shown in Table 11-3.
The alternate pin configuration is as follows:
OC0A/OC1C/PCINT7, Bit 7
OC0A, Output Compare Match A output: The PB7 pin can serve as an external output for the
Timer/Counter0 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to
serve this function. The OC0A pin is also the output pin for the PWM mode timer function.
OC1C, Output Compare Match C output: The PB7 pin can serve as an external output for the
Timer/Counter1 Output Compare C. The pin has to be configured as an output (DDB7 set “one”)
to serve this function. The OC1C pin is also the output pin for the PWM mode timer function.
PCINT7, Pin Change Interrupt source 7: The PB7 pin can serve as an external interrupt source.
PCINT6, Bit 6
PCINT6, Pin Change Interrupt source 6: The PB6 pin can serve as an external interrupt source.
PCINT5, Bit 5
PCINT5, Pin Change Interrupt source 5: The PB5 pin can serve as an external interrupt source.
T1/PCINT4, Bit 4
T1, Timer/Counter1 counter source.
PCINT4, Pin Change Interrupt source 4: The PB4 pin can serve as an external interrupt source.
PDO/MISO/PCINT3 – Port B, Bit 3
Read/Write
R/W
R
R/W
R
R/W
Initial Value
0
Table 11-3.
Port B Pins Alternate Functions
Port Pin
Alternate Functions
PB7
OC0A/OC1C/PCINT7 (Output Compare and PWM Output A for Timer/Counter0, Output
Compare and PWM Output C for Timer/Counter1 or Pin Change Interrupt 7)
PB6
PCINT6 (Pin Change Interrupt 6)
PB5
PCINT5 (Pin Change Interrupt 5)
PB4
T1/PCINT4 (Timer/Counter1 Clock Input or Pin Change Interrupt 4)
PB3
PDO/MISO/PCINT3 (Programming Data Output or SPI Bus Master Input/Slave Output or
Pin Change Interrupt 3)
PB2
PDI/MOSI/PCINT2 (Programming Data Input or SPI Bus Master Output/Slave Input or Pin
Change Interrupt 2)
PB1
SCLK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)
PB0
SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)
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