Hi,

I'm using a Cypress EZ-USB AN2131, running at 12.0 MHz. I'm trying to understand the toggle rate of PortC. Here is my code:

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MOV R1, #LOW(PortC_Out) ; Page reg set at 7F

MAIN:
MOV A, #00010000b ; Set PortC[4]
MOVX @R1, A
CLR A
MOVX @R1, A
JMP MAIN

Watching PortC[4], it toggles at 1.67 uS, or 20 instruction cyles. Shouldn't this be 0.5 uS, or 6 cycles?

Thanks for any help,

Steve