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THE I/O PORTS 45
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EEPROM data corruption for off-chip EEPROM IC. Specifically, EEPROM data corruptions at EEPROM address $00 have been reported. The recommended solutions for preventing EEPROM date corruption are as follows:
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1. Use a brown-out detector (BOD) to detect periods of time when the supply voltage is
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low and assert reset during such time. It is better to reset the system than to proceed with the possibility of EEPROM data corruption. 2. Avoid writing to the EEPROM during periods of low supply voltage. This is easier said than done. 3. Do not use EEPROM at all! This is a rather extreme solution. However, keeping in mind the reports of EEPROM data corruption at address $00, it may be worthwhile to avoid using the EEPROM address $00.
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3.8 The I/O Ports
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All of the AVR controllers have some amount of I/O, which ranges from 3 bits on the AT90S2323 to 48 bits on Mega103. All the output bits of the AVR controllers can sink 20 mA of current, which makes it very suitable to drive LEDs directly without the need of external buffers. All the I/O ports have three I/O addresses associated with them. The three addresses are required for configuring the individual bits as input or output; the other address is required to output data to those (or all) bits configured as output, and the third address is required to read data from those (or all) pins configured as input. These ports are labeled as DDRx, PORTx, PINx for a given port x. The DDRx is the data direction register. Writing a 1 to a bit in the DDR makes the corresponding bit as output bit in portx. Thereafter, to output a 1 on the port bit, the corresponding bit can be set or reset using the CBI or SBI instruction or an OUT instruction.
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;Using CBI and SBI to write to ports SBI DDRB, 1 ;make bit 1 as output bit on PORTB CBI PORTB, 1 ;make PORTB bit 1 as 0 SBI PORTB, 1 ;make PORTB bit 1 as 1
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Another way to change port values is by using the IN and OUT instructions:
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;Using OUT instruction to write to ports LDI R18, 0b00000010 OUT DDRB, R18 ;make bit 1 as output bit on PORTB LDI R18, 0b00000000 OUT PORTB, R18 ;make PORTB bit 1 as 0 LDI R18, 0b00000010 OUT PORTB, R18 ;make PORTB bit 1 as 1
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Similarly, to read data at the input pin of a port, the PINx register is used. The PINx is directly connected to the pin of the port. The port pin can be provided with an internal pullup by writing a 1 to the port bit at the addresses PORTx. The value of this pullup resistor is between 30 Kohm and 150 Kohm. The corresponding value of the pullup current is between 160 A and 33 A. Instead, if a 0 is written to the port bit at address PORTx, then the pullup is removed and the input pin is left floating in a high-impedance state.
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46 THE AVR MICROCONTROLLER ARCHITECTURE
;Using IN instruction to read from ports LDI R18, 0b00000000 OUT DDRB, R18 ;make all bits as input bit on PORTB LDI R18, 0b11111111 OUT PORTB, R18 ;Enable the pullup resistors on the PORTB IN R18, PINB ;read the pins on portB. R18 has the result.
See Figure 3.31.
3.9 The SRAM
The SRAM is available on most high-end processors. The amount varies from 128 bytes to 4 Kbytes. The SRAM is accessed using the many data access instructions either directly or indirectly using a pointer register. The SRAM is used for the stack also. The SRAM access time is two clock cycles, as illustrated in Figure 3.7.
FIGURE 3.31 Details of one of the port bits (PORTD4).
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ldi r30, $60 clr r31 st z+, temp
;init the pointer into SRAM to 60hex ;60hex is start of SRAM in 2313 ;now Z pointer is pointing to the SRAM ;store a value in register temp to SRAM ;and increment the address
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