參數(shù)資料
型號(hào): 56F8014
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 16-bit Digital Signal Controllers
中文描述: 16位數(shù)字信號(hào)控制器
文件頁數(shù): 75/124頁
文件大?。?/td> 1878K
代理商: 56F8014
Register Descriptions
56F8014 Technical Data, Rev. 3
Freescale Semiconductor
Preliminary
75
6.3.10
I/O Short Address Location Register (SIM_IOSAHI and
SIM_IOSALO)
The I/O Short Address Location registers are used to specify the memory referenced via the I/O short
address mode. The I/O short address mode allows the instruction to specify the lower six bits of address;
the upper address bits are not directly controllable. This register set allows limited control of the full
address, as shown in
Figure 6-12
.
Figure 6-12 I/O Short Address Determination
With this register set, an interrupt driver can set the SIM_IOSALO 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 instruction cycles.
Figure 6-13 I/O Short Address Location High Register (SIM_IOSAHI)
6.3.10.1 Reserved—Bits 15—2
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
Base + $D
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ISAL[23:22]
Write
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
Instruction Portion
Hard Coded” Address Portion
6 Bits from I/O Short Address Mode Instruction
16 Bits from SIM_IOSALO Register
2 bits from SIM_IOSAHI Register
Full 24-Bit for Short I/O Address
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