C8051F560-TB Silicon Laboratories Inc, C8051F560-TB Datasheet - Page 147
C8051F560-TB
Manufacturer Part Number
C8051F560-TB
Description
BOARD PROTOTYPE W/C8051F560
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheet
1.TOOLSTICK560DC.pdf
(302 pages)
Specifications of C8051F560-TB
Contents
Board
Processor To Be Evaluated
C8051F56x
Processor Series
C8051F56x
Interface Type
USB
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
1.8 V to 5.25 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F55x, C8051F56x, C8051F57x
For Use With
336-1691 - KIT DEVELOPMENT FOR C8051F560
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1694
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17.4. Multiplexed Mode
The External Memory Interface operates only in a Multiplexed mode. In Multiplexed mode, the Data Bus
and the lower 8-bits of the Address Bus share the same Port pins: AD[7:0]. In this mode, an external latch
(74HC373 or equivalent logic gate) is used to hold the lower 8-bits of the RAM address. The external latch
is controlled by the ALE (Address Latch Enable) signal, which is driven by the External Memory Interface
logic. An example of a Multiplexed Configuration is shown in Figure 17.1.
In Multiplexed mode, the external MOVX operation can be broken into two phases delineated by the state
of the ALE signal. During the first phase, ALE is high and the lower 8-bits of the Address Bus are pre-
sented to AD[7:0]. During this phase, the address latch is configured such that the Q outputs reflect the
states of the ‘D’ inputs. When ALE falls, signaling the beginning of the second phase, the address latch
outputs remain fixed and are no longer dependent on the latch inputs. Later in the second phase, the Data
Bus controls the state of the AD[7:0] port at the time RD or WR is asserted.
See Section “17.6.1. Multiplexed Mode” on page 151 for more information.
E
M
I
F
AD[7:0]
A[15:8]
/WR
ALE
/RD
Figure 17.1. Multiplexed Configuration Example
ADDRESS/DATA BUS
ADDRESS BUS
Rev. 1.1
V
DD
8
(Optional)
74HC373
G
D
C8051F55x/56x/57x
Q
A[15:8]
A[7:0]
I/O[7:0]
CE
WE
OE
64 K X 8
SRAM
147
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