MA009A Datasheet, PDF (5/19 Pages) Megawin Technology Co., Ltd – 24-bit I/O extender with interrupt function

Control Registers Definition
The default value of all the control register is 0 after power on.
Chip Address
Name
C_ADDR
Bit 7
-
Chip address register.
Bit 6
-
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2
A02
Bit 1
A01
Bit 0
A00
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
Name
Bit 7 Bit 6
P0
P07 P06
Port P0 input status register.
Bit 5
P05
Bit 4
P04
Bit 3
P03
Bit 2
P02
Bit 1
P01
Bit 0
P00
Name
P0PR
Bit 7
-
Bit 6
-
Port P0 pull high control register.
Bit 5
-
Bit 4
-
Bit 3
-
Bit 2 Bit 1 _{Bit 0}
- PR01 PR00
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
Name
Bit 7 Bit 6 Bit 5
P0PSR
-
-
-
Port P0 strong pull high selection register.
Bit 4
-
Bit 3
-
Bit 2 Bit 1 _{Bit 0}
-
PS01 PS00
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)
Name
P0IEN
Bit 7
IE07
Bit 6
IE06
Port P0 interrupts enable register.
Bit 5
IE05
Bit 4
IE04
Bit 3
IE03
Bit 2
IE02
Bit 1
IE01
Bit 0
IE00
P0IEN.0 ~ P0IEN.7: P0.0 ~ P0.7 falling edge interrupts control, 0: disable, 1: enable
Name
P0EVT
Bit 7 Bit 6 Bit 5
ST07 ST06 ST05
Port P0 interrupts events status register.
Bit 4
ST04
Bit 3
ST03
Bit 2
ST02
Bit 1
ST01
Bit 0
ST00
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
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MA009A Technical Summary
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