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AT90USB646 Datasheet(PDF) 37 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 37 Page - ATMEL Corporation |
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37 / 434 page  37 7593A–AVR–02/06 AT90USB64/128 Note: 1. See “About Code Examples” on page 8. Assembly Code Example(1) ; OFFSET is defined to 0x4000 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 r16, 0xFF out DDRC, r16 ldi r16, 0x00 out PORTC, r16 ; release PC7:6 ldi r16, (1<<XMM1) sts XMCRB, r16 ; write 0xAA to address 0x0001 of external ; memory ldi r16, 0xaa sts 0x0001+OFFSET, r16 ; re-enable PC7:6 for external memory ldi r16, (0<<XMM1) sts XMCRB, r16 ; store 0x55 to address (OFFSET + 1) of ; external memory ldi r16, 0x55 sts 0x0001+OFFSET, r16 C Code Example(1) #define OFFSET 0x4000 void XRAM_example(void) { unsigned char *p = (unsigned char *) (OFFSET + 1); DDRC = 0xFF; PORTC = 0x00; XMCRB = (1<<XMM1); *p = 0xaa; XMCRB = 0x00; *p = 0x55; } |
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