ATMEGA8515L-8PC Atmel, ATMEGA8515L-8PC Datasheet - Page 33
![IC AVR MCU 8K LV 8MHZ COM 40-DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8515L-8PC
Manufacturer Part Number
ATMEGA8515L-8PC
Description
IC AVR MCU 8K LV 8MHZ COM 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515L-8PC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
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 ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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Using all 64KB Locations of
External Memory
2512K–AVR–01/10
Since the External Memory is mapped after the Internal Memory as shown in Figure 11,
only 64,928 bytes of External Memory is available by default (address space 0x0000 to
0x025F is reserved for Internal Memory). However, it is possible to take advantage of
the entire External Memory by masking the higher address bits to zero. This can be
done by using the XMMn bits and control by software the most significant bits of the
address. By setting Port C to output 0x00, and releasing the most significant bits for nor-
mal Port Pin operation, the Memory Interface will address 0x0000 - 0x1FFF. See code
example below.
Note:
Care must be exercised using this option as most of the memory is masked away.
Assembly Code Example
C Code Example
#define OFFSET 0x2000
void XRAM_example(void)
{
unsigned char *p = (unsigned char *) (OFFSET + 1);
DDRC = 0xFF;
PORTC = 0x00;
SFIOR = (1<<XMM1) | (1<<XMM0);
*p = 0xaa;
SFIOR = 0x00;
*p = 0x55;
}
; OFFSET is defined to 0x2000 to ensure
; external memory access
; Configure Port C (address high byte) to
; output 0x00 when the pins are released
; for normal Port Pin operation
ldi
out
ldi
out
; release PC7:5
ldi
out
; write 0xAA to address 0x0001 of external
; memory
ldi
sts
; re-enable PC7:5 for external memory
ldi
out
; store 0x55 to address (OFFSET + 1) of
; external memory
ldi
sts
1. See “About Code Examples” on page 7.
r16, 0xFF
DDRC, r16
r16, 0x00
PORTC, r16
r16, (1<<XMM1)|(1<<XMM0)
SFIOR, r16
r16, 0xaa
0x0001+OFFSET, r16
r16, (0<<XMM1)|(0<<XMM0)
SFIOR, r16
r16, 0x55
0x0001+OFFSET, r16
(1)
(1)
ATmega8515(L)
33
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