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AT90S1200

8-Bit Microcontroller with 1K bytes In-System Programmable Flash

Atmel Corporation 

I/O Memory

The I/O space definition of the AT90S1200 is shown in the following table.

Table 1. The AT90S1200 I/O Space

Address Hex

Name Function

$3F

SREG Status REGister

$3B

GIMSK General Interrupt MaSK register

$39

TIMSK Timer/Counter Interrupt MaSK register

$38

TIFR

Timer/Counter Interrupt Flag register

$35

MCUCR MCU general Control Register

$33

TCCR0 Timer/Counter0 Control Register

$32

TCNT0 Timer/Counter0 (8-bit)

$21

WDTCR Watchdog Timer Control Register

$1E

EEAR EEPROM Address Register

$1D

EEDR EEPROM Data Register

$1C

EECR EEPROM Control Register

$18

PORTB Data Register, Port B

$17

DDRB Data Direction Register, Port B

$16

PINB

Input Pins, Port B

$12

PORTD Data Register, Port D

$11

DDRD Data Direction Register, Port D

$10

PIND

Input Pins, Port D

$08

ACSR Analog Comparator Control and Status Register

Note: Reserved and unused locations are not shown in the table.

All AT90S1200 I/Os and peripherals are placed in the I/O space. The different I/O loca-

tions are accessed by the IN and OUT instructions transferring data between the 32

general purpose 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 instruc-

tions. Refer to the instruction set chapter for more details.

For compatibility with future devices, reserved bits should be written to zero if accessed.

Reserved I/O memory addresses should never be written.

Some of the status flags are cleared by writing a logical one 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 registers

$00 to $1F only.

The different I/O and peripherals control registers are explained in the following

sections.

10 AT90S1200

0838H–AVR–03/02

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