at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 18

• Manufacturer Part Number: at90ls4433
• Description: At90s4433 8-bit Avr Microcontroller With 4k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

18
AT90S/LS4433
Table 2. AT90S4433 I/O Space
Note:
All AT90S4433 I/Os and peripherals are placed in the I/O space. The I/O locations are
accessed by the IN and OUT instructions transferring data between the 32 general pur-
pose working registers and the I/O space. I/O Registers within the address range $00 -
$1F are directly bit-accessible using the SBI and CBI instructions. In these registers, the
value of single bits can be checked by using the SBIS and SBIC instructions. Refer to
the instruction set section for more details. When using the I/O specific commands IN
and OUT, the I/O addresses $00 - $3F must be used. When addressing I/O Registers as
SRAM, $20 must be added to this address. All I/O Register addresses throughout this
document are shown with the SRAM address in parentheses.
For compatibility with future devices, reserved bits should be written to zero when
accessed. Reserved I/O memory addresses should never be written.
Some of the Status Flags are cleared by writing a logical “1” to them. Note that the CBI
and SBI instructions will operate on all bits in the I/O Register, writing a one back into
any flag read as set, thus clearing the flag. The CBI and SBI instructions work with reg-
isters $00 to $1F only.
The I/O and Peripherals Control Registers are explained in the following sections.
(SRAM Address)
I/O Address
$0D ($2D)
$0C ($2C)
$0E ($2E)
$0B ($2B)
$0A ($2A)
$0F ($2F)
$17 ($37)
$16 ($36)
$15 ($35)
$14 ($34)
$13 ($33)
$12 ($32)
$11 ($31)
$10 ($30)
$09 ($29)
$08 ($28)
$07 ($27)
$06 ($26)
$05 ($25)
$04 ($24)
$03 ($23)
1. Reserved and unused locations are not shown in the table.
Name
DDRB
PINB
PORTC
DDRC
PINC
PORTD
DDRD
PIND
SPDR
SPSR
SPCR
UDR
UCSRA
UCSRB
UBRR
ACSR
ADMUX
ADCSR
ADCH
ADCL
UBRRHI
(1)
Function
Data Direction Register, Port B
Input Pins, Port B
Data Register, Port C
Data Direction Register, Port C
Input Pins, Port C
Data Register, Port D
Data Direction Register, Port D
Input Pins, Port D
SPI I/O Data Register
SPI Status Register
SPI Control Register
UART I/O Data Register
UART Control and Status Register A
UART Control and Status Register B
UART Baud Rate Register
Analog Comparator Control and Status Register
ADC Multiplexer Select Register
ADC Control and Status Register
ADC Data Register High
ADC Data Register Low
UART Baud Rate Register High
(Continued)
1042H–AVR–04/03