AT91SAM7S64 >> Assembly
Phase Locked Loop(PLL)
參考資訊：
1. pdf
2. pid
3. keil
4. sam7s_samples
MOSCEN
MUL、DIV
PLL
Example
main.s
.equ PMC_PCER, 0xfffffc10 .equ CKGR_MOR, 0xfffffc20 .equ CKGR_PLLR, 0xfffffc2c .equ PMC_MCKR, 0xfffffc30 .equ PIO_PER, 0xfffff400 .equ PIO_OER, 0xfffff410 .equ PIO_SODR, 0xfffff430 .equ PIO_CODR, 0xfffff434 .text .align 2 .global _start _start: b reset _undef: b . _swi: b . _pabort: b . _dabort: b . _reserved: b . _irq: b . _fiq: b . reset: ldr r0, =CKGR_MOR ldr r1, =0x601 str r1, [r0] ldr r0, =CKGR_PLLR ldr r1, =0x191c05 str r1, [r0] ldr r0, =PMC_MCKR ldr r1, =7 str r1, [r0] ldr r0, =PMC_PCER ldr r1, =4 str r1, [r0] ldr r0, =PIO_PER ldr r1, =0x40000 str r1, [r0] ldr r0, =PIO_OER ldr r1, =0x40000 str r1, [r0] loop: ldr r0, =PIO_SODR ldr r1, =0x40000 str r1, [r0] ldr r4, =0x500000 1: subs r4, #1 bne 1b ldr r0, =PIO_CODR ldr r1, =0x40000 str r1, [r0] ldr r4, =0x500000 1: subs r4, #1 bne 1b b loop .end
完成
