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SRAM
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
14-5
14.7.1
Example Code
To initialize SRAM correctly, use the store multiple word (
stmw)
instruction to implement 64-bit writes
to all SRAM locations. The
stmw
instruction concatenates two 32-bit registers to implement a single
64-bit write.
The following example code illustrates the use of the
stmw
instruction to initialize the SRAM ECC bits.
init_RAM:
lis
r11,0x4000
# base address of the SRAM, 64-bit word aligned
ori
r11,r11,0
# not needed for this address but can be for others
li
r12,1024
# loop counter to get all of SRAM;
# 128k/4 bytes/32 GPRs = 1024
mtctr r12
init_ram_loop:
stmw
r0,0(r11)
# write all 32 GPRs to SRAM
addi
r11,r11,128
# inc the ram ptr; 32 GPRs * 4 bytes = 128
bdnz
init_ram_loop
# loop for 128k of SRAM
blr #
done
Содержание MPC5566
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