MC68306EH16B Freescale Semiconductor, MC68306EH16B Datasheet - Page 99
![IC MPU INTEGRATED 16MHZ 132-PQFP](/photos/39/60/396092/4533518_sml.jpg)
MC68306EH16B
Manufacturer Part Number
MC68306EH16B
Description
IC MPU INTEGRATED 16MHZ 132-PQFP
Manufacturer
Freescale Semiconductor
Specifications of MC68306EH16B
Processor Type
M683xx 32-Bit
Speed
16MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-MQFP, 132-PQFP
Controller Family/series
68K
Core Size
32 Bit
Cpu Speed
16.7MHz
No. Of Timers
1
Embedded Interface Type
UART
Digital Ic Case Style
PQFP
Supply Voltage Range
4.75V To 5.25V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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There are three ways to disable a chip select, corresponding to the three match
conditions:
Chip selects 7 through 4 are still matched even if running in address mode (AMODE = 0).
They can be disabled, or they can be used to provide automatic DTACK timing for
externally decoded resources.
If more decodes are necessary than are supplied on the MC68306, one of the existing
chip selects should be used (Figure 5-1) to enable the external decoding, since some
signals used to qualify the chip selects are not available externally.
The registers listed below allow the base address, range, and cycle duration of each chip
select to be independently programmed. The chip select configuration registers do not
support byte writes. The registers can be written as either 16-bit or 32-bit, but 32-bit
accesses are preferred. Any write access affects all 16 bits of the high half or low half
register. Only chip select 0 is affected by reset.
5.2.6.1 CHIP SELECT CONFIGURATION REGISTERS (HIGH HALF)
FFFFFFC0 (CS0)
FFFFFFDC (CS7), FFFFFFD8 (CS6), FFFFFFD4 (CS5), FFFFFFD0 (CS4), FFFFFFCC (CS3), FFFFFFC8 (CS2),
FFFFFFC4 (CS1)
CSA31–CSA17—Chip Select Address
MOTOROLA
RESE
RESE
CSA31
CSA31
15
T:
15
T:
U
1. All CSFCx bits are zero
2. Both CSW/CSR are zero
3. Any unused CSAx bit is one.
0
This bit field selects the base address for each chip select.
CSA3
CSA3
14
14
0
0
0
U
CSA2
CSA2
13
13
9
0
9
U
Unused chip selects must be disabled to prevent interference
with other chip selects, DRAM, or externally decoded
resources.
CSA2
CSA2
12
12
8
0
8
U
CSA2
CSA2
Freescale Semiconductor, Inc.
11
11
7
0
7
U
For More Information On This Product,
CSA2
CSA2
10
10
6
0
6
U
MC68306 USER'S MANUAL
Go to: www.freescale.com
CSA2
CSA2
9
5
0
9
5
U
CSA2
CSA2
8
4
0
8
4
U
NOTE
CSA2
CSA2
7
3
0
7
3
U
CSA22
CSA22
U
6
0
6
CSA21
CSA21
5
0
5
U
CSA20
CSA20
4
0
4
U
CSA19
CSA19
3
0
3
U
CSA18
CSA18
2
0
2
U
SUPERVISOR ONLY
SUPERVISOR ONLY
CSA17
CSA17
U
1
0
1
CSW
CSW
U
5- 9
0
1
0
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