ma009a Megawin Technology, ma009a Datasheet - Page 5

• Manufacturer Part Number: ma009a
• Description: 24-bit I/o Extender With Interrupt Function
• Manufacturer: Megawin Technology

Control Registers Definition
The default value of all the control register is 0 after power on.
Chip Address
Chip address register.
Only the contents of chip address register are same as chip address pin A2, A1 and A0, all command could be
enabled. This function will make the master to connect more than one MA009 easily.
Input Port 0
Port P0 input status register.
Port P0 pull high control register.
P0PR.0: P0.0 ~ P0.3 pull high control, 0: enable (large resistance, 350K), 1: disable
P0PR.1: P0.4 ~ P0.7 pull high control, 0: enable (large resistance, 350K), 1: disable
Port P0 strong pull high selection register.
P0PSR.0: P0.0 ~ P0.3 strong pull high selection, 0: disable, 1: enable (small resistance, 50K)
P0PSR.1: P0.4 ~ P0.7 strong pull high selection, 0: disable, 1: enable (small resistance, 50K)
Port P0 interrupts enable register.
P0IEN.0 ~ P0IEN.7: P0.0 ~ P0.7 falling edge interrupts control, 0: disable, 1: enable
Port P0 interrupts events status register.
When a falling edge signal is occurs in any interrupt enabled (the bit 0 or bit 1 of P0IEN is set to 1) pins of port P0,
the corresponding bit of P0EVT will be set to 1. The interrupt will be generated from the INTB (1!0) pin in this
condition, and the mater (for example, a microcontroller) can read the interrupt status from P0EVT. The master
can send EVTCLR (13H) command to MA009 to clear the P0EVT after the interrupt event is processed. This
MEGAWIN
C_ADDR
P0PSR
P0EVT
P0IEN
Name
Name
Name
P0PR
Name
Name
Name
P0
ST07
IE07
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
P07
-
-
-
ST06
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
IE06
Bit 6
P06
-
-
-
ST05
IE05
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
P05
-
-
-
MA009A Technical Summary
ST04
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
IE04
Bit 4
P04
-
-
-
ST03
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
IE03
Bit 3
P03
-
-
-
ST02
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
IE02
Bit 2
A02
P02
-
-
PR01
PS01
ST01
IE01
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
A01
P01
PR00
PS00
ST00
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
IE00
Bit 0
A00
P00
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