pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 84
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pc87591l
Manufacturer Part Number
pc87591l
Description
Lpc Mobile Embedded Controllers
Manufacturer
National Semiconductor Corporation
Datasheet
1.PC87591L.pdf
(437 pages)
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4.0 Embedded Controller Modules
I/O Zone Configuration Register (IOCFG)
The IOCFG register controls the configuration of the I/O zone. On reset, it is initialized to 069F
Location: 00 F982
Type: R/W
Bit
Name
Reset
15-10 Reserved.
2-0
4-3
6-5
Bit
7
8
9
WAIT. Number of TIW clock cycles that extend the bus cycle.
Bits
2 1 0
0 0 0:
0 0 1:
0 1 0:
0 1 1:
1 0 0:
1 0 1:
1 1 0:
1 1 1:
HOLD. Number of T
Bits
4 3
0 0:
0 1:
1 0:
1 1:
Reserved.
Bus Width. Sets the external bus width used for the I/O zone. It is initialized during reset to its default value.
0: 8-bit bus
1: 16-bit bus (default)
Reserved.
IPST (Idle After Bus Cycle). Determines if an idle cycle follows the current bus cycle when the next bus cycle
is in a different zone.
0: No idle cycle inserted
1: Idle cycle inserted
15
0
Number
None
One
Two
Three
16
Number
None
One
Two
Three
Four
Five
Six
Seven
14
0
Reserved
13
hold
0
clock cycles.
12
0
11
0
10
(Continued)
1
IPST Res
9
1
Description
84
8
0
BW
7
1
Reserved
6
0
5
0
4
1
HOLD
16
.
3
1
2
1
WAIT
1
1
Revision 1.07
0
1
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