AT90S8515A-4AI Atmel, AT90S8515A-4AI Datasheet - Page 3
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AT90S8515A-4AI
Manufacturer Part Number
AT90S8515A-4AI
Description
IC MCU 8K FLSH 4MHZ LV IT 44TQFP
Manufacturer
Atmel
Series
AVR® 90Sr
Datasheets
1.AT90S8515-4AC.pdf
(112 pages)
2.AT90S8515-4AC.pdf
(4 pages)
3.AT90S8515-4AC.pdf
(4 pages)
Specifications of AT90S8515A-4AI
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
1. Skip Instruction with Interrupts
1195E–09/01
A skip instruction (SBRS, SBRC, SBIS, SBIC, CPSE) that skips a 2-word instruction needs 3 clock cycles. If an inter-
rupt occurs during the first or second clock cycle of this skip instruction, the return address will not be stored correctly
on the stack. In this situation, the address of the second word in the 2-word instruction is stored. This means that on
return from interrupt, the second word of the 2-word command will be decoded and executed as an instruction. The
AT90S8515 has two 2-word instructions: LDS and STS.
Note 1: This can only occur if all of the following conditions are true:
- A skip instruction is followed by a 2-word instruction.
- The skip instruction is actually skipping the 2-word instruction.
- Interrupts are enabled, and at least one interrupt source can generate an interrupt.
- An interrupt arrives in the first or second cycle of the skip instruction.
Note 2: This will cause problems only if the address of the following LDS or STS command points to an address
beyond 400 Hex.
Problem Fix/Workaround
For assembly program, avoid skipping a 2-word instruction if interrupts are enabled.
The following C-compilers handle this sequence correctly:
- IAR Compiler, version 1.40b or later
- Image Craft Compiler, all versions
- Codevision Compiler, version 1.0.0.5 or later
AT90S8515 Errata
3