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mov OSCXCN, #067h ; External Oscillator Control Register
clr A
djnz ACC, $ ;wait for
djnz ACC, $ ;at least 1ms
OX_WAIT:
mov A, OSCXCN
jnb ACC.7, OX_WAIT ;poll XTLVLD
mov OSCICN, #0ch ; Internal Oscillator Control Register
mov XBR0, #000h ; XBAR0: Initial Reset Value
mov XBR1, #080h ; XBAR1: Initial Reset Value
mov XBR2, #11000000b ; XBAR2: Initial Reset Value
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