Freescale-semiconductor 56F8122 Manual do Utilizador Página 90

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56F8322 Techncial Data, Rev. 10.0
90 Freescale Semiconductor
Preliminary
Figure 6-13 I/O Short Address Determination
With this register set, an interrupt driver can set the SIM_ISALL register pair to point to its peripheral
registers and then use the I/O Short addressing mode to reference them. The ISR should restore this register
to its previous contents prior to returning from interrupt.
Note: The default value of this register set points to the EOnCE registers.
Note: The pipeline delay between setting this register set and using short I/O addressing with the new value
is five cycles.
Figure 6-14 I/O Short Address Location High Register (SIM_ISALH)
6.5.10.1 Input/Output Short Address Low (ISAL[23:22])—Bit 1–0
This field represents the upper two address bits of the “hard coded” I/O short address.
Figure 6-15 I/O Short Address Location Low Register (SIM_ISALL)
Base + $D 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read
1 1 1 1 1 1 1 1 1 1 1 1 1 1
ISAL[23:22]
Write
RESET
111111 1 11111 1 1 11
Base + $E 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read
ISAL[21:6]
Write
RESET
111111 1 11111 1 1 11
Instruction Portion
Hard Coded” Address Portion
6 Bits from I/O Short Address Mode Instruction
16 Bits from SIM_ISALL Register
2 bits from SIM_ISALH Register
Full 24-Bit for Short I/O Address
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