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CY14E064L
Document Number: 001-06543 Rev. *D
Page 6 of 17
Preventing STOREs
The STORE function is disabled by holding HSB high with a
driver capable of sourcing 30 mA at a VOH of at least 2.2V,
because it has to overpower the internal pull down device. This
device drives HSB LOW for 20
μs at the onset of a STORE.
When the CY14E064L is connected for AutoStore operation
(system VCC connected to VCC and a 68 μF capacitor on VCAP)
and VCC crosses VSWITCH on the way down, the CY14E064L
attempts to pull HSB LOW. If HSB does not actually get below
VIL, the part stops trying to pull HSB LOW and abort the
STORE attempt.
Table 1. Hardware Mode Selection
CE
WE
HSB
A12–A0
Mode
IO
Power
H
X
H
X
Not Selected
Output High Z
Standby
L
H
H
X
Read SRAM
Output Data
Active
L
L
H
X
Write SRAM
Input Data
Active
X
X
L
X
Non-volatile STORE
Output High Z
ICC2
L
H
H
0000
1555
0AAA
1FFF
10F0
0F0F
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Non-volatile STORE
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
Active
ICC2
L
H
H
0000
1555
0AAA
1FFF
10F0
0F0E
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Non-volatile RECALL
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
Active
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