Freescale Semiconductor, Inc.
Table 4-10 General-Purpose Chip Select Starting Address
Size (Bytes)
Valid Starting Address
Bits
0 K (Disabled)
None
1 K
2 K
GA[15:10]
GA[15:11]
GA[15:12]
GA[15:13]
GA[15:14]
GA15
4 K
8 K
16 K
32 K
64 K
None
CSGSIZ — General-Purpose Chip Select Size Control
$105F
Bit 7
IO1AV
0
6
IO2AV
0
5
—
0
4
GNPOL
0
3
GAVLD
0
2
GSIZA
1
1
GSIZB
1
Bit 0
GSIZC
1
RESET:
IO1AV — I/O Chip Select 1 Address Valid
0 = I/O chip select 1 is active during E-clock valid time (E-clock high)
1 = I/O chip select 1 is active during address valid time
IO2AV — I/O Chip Select 2 Address Valid
0 = I/O chip select 1 is active during E-clock valid time (E-clock high)
1 = I/O chip select 1 is active during address valid time
GNPOL — General-Purpose Chip Select Polarity Select
0 = CSGEN is active low
1 = CSGEN is active high
GAVLD — General-Purpose Chip Select Address Valid Select
0 = CSGEN is valid during E-clock valid time (E-clock high)
1 = CSGEN is valid during address valid time
G1SZA–G1SZC — General-Purpose Chip Select Size
Refer to Table 4-11.
Table 4-11 General-Purpose Chip Select Size Control
GSIZA
GSIZB
GSIZC
Size (Bytes)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
64 K
32 K
16 K
8 K
4 K
2 K
1 K
0 K (Disabled)
OPERATING MODES AND ON-CHIP MEMORY
MC68HC11F1
4-22
TECHNICAL DATA
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