MC56F8346 Freescale Semiconductor, Inc, MC56F8346 Datasheet - Page 124

• Manufacturer Part Number: MC56F8346
• Description: 56f8300 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

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:
Note:
6.5.10.1
This field represents the upper two address bits of the “hard coded” I/O short address.
124
Base + $D
Base + $E
RESET
RESET
Write
Write
Read
Read
The default value of this register set points to the EOnCE registers.
The pipeline delay between setting this register set and using short I/O addressing with the new value
is three cycles.
Input/Output Short Address Low (ISAL[23:22])—Bit 1–0
Figure 6-14 I/O Short Address Location High Register (SIM_ISALH)
Figure 6-15 I/O Short Address Location Low Register (SIM_ISALL)
Full 24-Bit for Short I/O Address
2 bits from SIM_ISALH Register
15
15
1
1
1
16 Bits from SIM_ISALL Register
14
14
1
1
1
Figure 6-13 I/O Short Address Determination
13
13
1
1
1
6 Bits from I/O Short Address Mode Instruction
12
12
1
1
1
56F8346 Technical Data, Rev. 15
11
11
1
1
1
“
10
10
1
1
1
Hard Coded” Address Portion
9
1
1
9
1
8
8
1
1
1
ISAL[21:6]
7
7
1
1
1
6
6
1
1
1
5
5
1
1
1
Instruction Portion
4
4
1
1
1
3
3
1
1
1
Freescale Semiconductor
2
2
1
1
1
ISAL[23:22]
1
1
1
1
Preliminary
0
0
1
1