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DS28DG02: 2Kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
PIO Direction
ADDR
122h
123h
b7
DIR7
X
b6
DIR6
X
b5
DIR5
X
b4
DIR4
X
b3
DIR3
DIR11
b2
DIR2
DIR10
b1
DIR1
DIR9
b0
DIR0
DIR8
There is general read and write access to these addresses. These registers are automatically loaded with data
from address 10Ch/10Dh when the device powers up.
BIT DESCRIPTION
DIRn: PIO Direction
X: (Not Assigned)
BIT(S)
—
—
DEFINITION
Direction of PIO0 to PIO11. DIR0 applies to PIO0, etc.
Legend : 0 ? output; 1 ? input
Reserved for future use.
PIO Read Inversion (PIO0 to PIO7)
ADDR
124h
b7
IMSK7
b6
IMSK6
b5
IMSK5
b4
IMSK4
b3
IMSK3
b2
IMSK2
b1
IMSK1
b0
IMSK0
There is general read and write access to this address. This register is automatically loaded with data from address
10Eh when the device powers up.
BIT DESCRIPTION
IMSKn: PIO Read-
Inversion
BIT(S)
—
DEFINITION
Read-inversion bit of PIO0 to PIO7. IMSK0 applies to PIO0, etc.
Legend : 0 ? no inversion; 1 ? inversion
PIO Read Inversion (PIO8 to PIO11), PIO Output Type and Output Mode
ADDR
125h
b7
OTM
b6
OT3
b5
OT2
b4
OT1
b3
IMSK11
b2
IMSK10
b1
IMSK9
b0
IMSK8
There is general read and write access to this address. This register is automatically loaded with data from address
10Fh when the device powers up.
BIT DESCRIPTION
IMSKn: PIO Read-
Inversion
OT1: Output Type
OT2: Output Type
OT3: Output Type
OTM: Output Mode
BIT(S)
b0 to b3
b4
b5
b6
b7
DEFINITION
Read-inversion bit of PIO8 to PIO11. PIM8 applies to PIO8, etc.
Legend : 0 ? no inversion; 1 ? inversion
Output type of PIO0 to PIO3;
Legend : 0 ? push-pull; 1 ? open drain
Output type of PIO4 to PIO7;
Legend : 0 ? push-pull; 1 ? open drain
Output type of PIO8 to PIO11;
Legend : 0 ? push-pull; 1 ? open drain
Output mode of PIO0 to PIO11;
Legend : 0 ? low-current, simultaneous switching; 1 ? high-current,
sequential switching
10 of 34
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