參數(shù)資料
型號： MR83C154XXX-25/883D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44
封裝： LCC-44
文件頁數(shù)： 129/141頁
文件大小： 7628K
代理商： MR83C154XXX-25/883D
58
2486AA–AVR–02/2013
ATmega8(L)
Special Function IO
Register – SFIOR
Bit 2 – 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 52 for more details about this feature.
Alternate Functions of
Port B
The Port B pins with alternate functions are shown in Table 22.
The alternate pin configuration is as follows:
XTAL2/TOSC2 – Port B, Bit 7
XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal Oscillator or Low-frequency
crystal Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
TOSC2: Timer Oscillator pin 2. Used only if internal calibrated RC Oscillator is selected as chip
clock source, and the asynchronous timer is enabled by the correct setting in ASSR. When the
AS2 bit in ASSR is set (one) to enable asynchronous clocking of Timer/Counter2, pin PB7 is dis-
connected from the port, and becomes the inverting output of the Oscillator amplifier. In this
mode, a crystal Oscillator is connected to this pin, and the pin cannot be used as an I/O pin.
If PB7 is used as a clock pin, DDB7, PORTB7 and PINB7 will all read 0.
XTAL1/TOSC1 – Port B, Bit 6
XTAL1: Chip clock Oscillator pin 1. Used for all chip clock sources except internal calibrated RC
Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.
TOSC1: Timer Oscillator pin 1. Used only if internal calibrated RC Oscillator is selected as chip
clock source, and the asynchronous timer is enabled by the correct setting in ASSR. When the
AS2 bit in ASSR is set (one) to enable asynchronous clocking of Timer/Counter2, pin PB6 is dis-
connected from the port, and becomes the input of the inverting Oscillator amplifier. In this
mode, a crystal Oscillator is connected to this pin, and the pin can not be used as an I/O pin.
If PB6 is used as a clock pin, DDB6, PORTB6 and PINB6 will all read 0.
Bit
7
6
5
4
3
2
1
0
ACME
PUD
PSR2
PSR10
SFIOR
Read/Write
R
R/W
Initial Value
0
Table 22. Port B Pins Alternate Functions
Port Pin
Alternate Functions
PB7
XTAL2 (
Chip Clock Oscillator pin 2)
TOSC2 (
Timer Oscillator pin 2)
PB6
XTAL1 (
Chip Clock Oscillator pin 1 or External clock input)
TOSC1 (
Timer Oscillator pin 1)
PB5
SCK (SPI Bus Master clock Input)
PB4
MISO (SPI Bus Master Input/Slave Output)
PB3
MOSI (SPI Bus Master Output/Slave Input)
OC2 (Timer/Counter2 Output Compare Match Output)
PB2
SS (SPI Bus Master Slave select)
OC1B (Timer/Counter1 Output Compare Match B Output)
PB1
OC1A (Timer/Counter1 Output Compare Match A Output)
PB0
ICP1 (Timer/Counter1 Input Capture Pin)
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