Manual
Table Of Contents
- Features
- Pin Configurations
- Description
- Architectural Overview
- General Purpose Register File
- ALU – Arithmetic Logic Unit
- In-System Programmable Flash Program Memory
- SRAM Data Memory
- Program and Data Addressing Modes
- Register Direct, Single Register Rd
- Register Direct, Two Registers Rd and Rr
- I/O Direct
- Data Direct
- Data Indirect with Displacement
- Data Indirect
- Data Indirect with Pre- decrement
- Data Indirect with Post- increment
- Constant Addressing Using the LPM Instruction
- Indirect Program Addressing, IJMP and ICALL
- Relative Program Addressing, RJMP and RCALL
- EEPROM Data Memory
- Memory Access Times and Instruction Execution Timing
- I/O Memory
- Reset and Interrupt Handling
- Reset Sources
- Power-on Reset
- External Reset
- Brown-out Detection
- Watchdog Reset
- MCU Status Register – MCUSR
- Interrupt Handling
- General Interrupt Mask Register – GIMSK
- General Interrupt Flag Register – GIFR
- Timer/Counter Interrupt Mask Register – TIMSK
- Timer/Counter Interrupt Flag Register – TIFR
- External Interrupts
- Interrupt Response Time
- MCU Control Register – MCUCR
- Sleep Modes
- Timer/Counters
- 16-bit Timer/Counter1
- Watchdog Timer
- EEPROM Read/Write Access
- Serial Peripheral Interface – SPI
- UART
- Analog Comparator
- Analog-to-Digital Converter
- I/O Ports
- Memory Programming
- Electrical Characteristics
- External Clock Drive Waveforms
- Typical Characteristics
- Register Summary
- Instruction Set Summary
- Ordering Information
- Packaging Information
- Errata for AT90S/LS4433 Rev. Rev. C/D/E/F
- Data Sheet ChangeLog for AT90S/LS4433
- Table of Contents
60
AT90S/LS4433
1042G–AVR–09/02
Table 19. UBR Settings at Various Crystal Frequencies
Baud Rate
1MHz
%Error
1.8432 MHz
%Error
2MHz
%Error
2.4576 MHz
%Error
2400
UBR=
25 0.2
UBR=
47 0.0
UBR=
51 0.2
UBR=
63 0.0
4800
UBR=
12 0.2
UBR=
23 0.0
UBR=
25 0.2
UBR=
31 0.0
9600
UBR= 6 7.5 UBR=
11 0.0
UBR=
12 0.2
UBR=
15 0.0
14400
UBR= 3 7.8 UBR=
70.0
UBR= 8 3.7 UBR= 10 3.1
19200
UBR= 2 7.8 UBR=
50.0
UBR= 6 7.5 UBR=
70.0
28800
UBR= 1 7.8 UBR=
30.0
UBR= 3 7.8 UBR= 4 6.3
38400
UBR= 1 22.9 UBR=
20.0
UBR= 2 7.8 UBR=
30.0
57600
UBR= 0 7.8 UBR=
10.0
UBR= 1 7.8 UBR= 2 12.5
76800
UBR= 0 22.9 UBR= 1 33.3 UBR= 1 22.9 UBR=
10.0
115200
UBR= 0 84.3 UBR=
00.0
UBR= 0 7.8 UBR= 0 25.0
Baud Rate
3.2768 MHz
%Error
3.6864 MHz
%Error
4MHz
%Error
4.608 MHz
%Error
2400
UBR=
84 0.4
UBR=
95 0.0
UBR=
103 0.2
UBR=
119 0.0
4800
UBR=
42 0.8
UBR=
47 0.0
UBR=
51 0.2
UBR=
59 0.0
9600
UBR=
20 1.6
UBR=
23 0.0
UBR=
25 0.2
UBR=
29 0.0
14400
UBR=
13 1.6
UBR=
15 0.0
UBR= 16 2.1 UBR=
19 0.0
19200
UBR= 10 3.1 UBR=
11 0.0
UBR=
12 0.2
UBR=
14 0.0
28800
UBR=
61.6
UBR=
70.0
UBR= 8 3.7 UBR=
90.0
38400
UBR= 4 6.3 UBR=
50.0
UBR= 6 7.5 UBR= 7 6.7
57600
UBR= 3 12.5 UBR=
30.0
UBR= 3 7.8 UBR=
40.0
76800
UBR= 2 12.5 UBR=
20.0
UBR= 2 7.8 UBR= 3 6.7
115200
UBR= 1 12.5 UBR=
10.0
UBR= 1 7.8 UBR= 2 20.0
Baud Rate
7.3728 MHz
%Error
8MHz
%Error
9.216 MHz
%Error
11.059 MHz
%Error
2400
UBR=
191 0.0
UBR=
207 0.2
UBR=
239 0.0
UBR= 287 -
4800
UBR=
95 0.0
UBR=
103 0.2
UBR=
119 0.0
UBR=
143 0.0
9600
UBR=
47 0.0
UBR=
51 0.2
UBR=
59 0.0
UBR=
71 0.0
14400
UBR=
31 0.0
UBR=
34 0.8
UBR=
39 0.0
UBR=
47 0.0
19200
UBR=
23 0.0
UBR=
25 0.2
UBR=
29 0.0
UBR=
35 0.0
28800
UBR=
15 0.0
UBR= 16 2.1 UBR=
19 0.0
UBR=
23 0.0
38400
UBR=
11 0.0
UBR=
12 0.2
UBR=
14 0.0
UBR=
17 0.0
57600
UBR=
70.0
UBR= 8 3.7 UBR=
90.0
UBR=
11 0.0
76800
UBR=
50.0
UBR= 6 7.5 UBR= 7 6.7 UBR=
80.0
115200
UBR=
30.0
UBR= 3 7.8 UBR=
40.0
UBR=
50.0