I/o memory – Rainbow Electronics AT90S2313 User Manual
Page 15
15
AT90S2313
0839I–AVR–06/02
Figure 22. On-chip Data SRAM Access Cycles
I/O Memory
The I/O space definition of the AT90S2313 is shown in Table 1.
System Clock Ø
WR
RD
Data
Data
Address
Address
T1
T2
T3
T4
Prev. Address
Read
Wr
ite
Table 1. AT90S2313 I/O Space
(1)
Address Hex
Name
Function
$3F ($5F)
SREG
Status Register
$3D ($5D)
SPL
Stack Pointer Low
$3B ($5B)
GIMSK
General Interrupt MaSK Register
$3A ($5A)
GIFR
General Interrupt Flag Register
$39 ($59)
TIMSK
Timer/Counter Interrupt MaSK Register
$38 ($58)
TIFR
Timer/Counter Interrupt Flag Register
$35 ($55)
MCUCR
MCU general Control Register
$33 ($53)
TCCR0
Timer/Counter 0 Control Register
$32 ($52)
TCNT0
Timer/Counter 0 (8-bit)
$2F ($4F)
TCCR1A
Timer/Counter 1 Control Register A
$2E ($4E)
TCCR1B
Timer/Counter 1 Control Register B
$2D ($4D)
TCNT1H
Timer/Counter 1 High Byte
$2C ($4C)
TCNT1L
Timer/Counter 1 Low Byte
$2B ($4B)
OCR1AH
Output Compare Register 1 High Byte
$2A ($4A)
OCR1AL
Output Compare Register 1 Low Byte
$25 ($45)
ICR1H
T/C 1 Input Capture Register High Byte
$24 ($44)
ICR1L
T/C 1 Input Capture Register Low Byte
$21 ($41)
WDTCR
Watchdog Timer Control Register
$1E ($3E)
EEAR
EEPROM Address Register
$1D ($3D)
EEDR
EEPROM Data Register
$1C ($3C)
EECR
EEPROM Control Register
$18 ($38)
PORTB
Data Register, Port B
$17 ($37)
DDRB
Data Direction Register, Port B
$16 ($36)
PINB
Input Pins, Port B