Configuration Registers

Index   R/W Mode    Description
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-40h    R/W         bit 7 = 1 enable pulldown on GPIO[1]
                    bit 6 = 1 enable pullup on GPIO[1]
                    bits 5-4 = 00 GPIO[1] is general purpose input
                             = 01 GPIO[1] is general purpose output
                             = 10 GPIO[1] is control pin
                             = 11 illegal
                    bit 3 = 1 enable pulldown on GPIO[0]
                    bit 2 = 1 enable pullup on GPIO[0]
                    bits 1-0 = 00 GPIO[0] is general purpose input
                             = 01 GPIO[0] is general purpose output
                             = 10 GPIO[0] is control pin
                             = 11 illegal
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-41h    R/W         bits 7-4 GPIO[3] configuration (see -40h)
                    bits 3-0 GPIO[2] configuration (see -40h)
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-42h    R/W         bits 7-4 GPIO[5] configuration (see -40h)
                    bits 3-0 GPIO[4] configuration (see -40h)
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-43h    R/W         bits 7-4 GPIO[7] configuration (see -40h)
                    bits 3-0 GPIO[6] configuration (see -40h)
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-44h    R/W         bits 7-4 GPIO[9] configuration (see -40h)
                    bits 3-0 GPIO[8] configuration (see -40h)
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-45h    R/W         bits 7-4 GPIO[11] configuration (see -40h)
                    bits 3-0 GPIO[10] configuration (see -40h)
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-46h    R/W         bits 7-4 GPIO[13] configuration (see -40h)
                    bits 3-0 GPIO[12] configuration (see -40h)
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-47h    R/W         bits 7-4 GPIO[15] configuration (see -40h)
                    bits 3-0 GPIO[14] configuration (see -40h)
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-48h    R/W         bits 7-4 GPIO[17] configuration (see -40h)
                    bits 3-0 GPIO[16] configuration (see -40h)
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-49h    R/W         bits 7-4 GPIO[19] configuration (see -40h)
                    bits 3-0 GPIO[18] configuration (see -40h)
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-4Ah    R/W         bits 7-4 GPIO[21] configuration (see -40h)
                    bits 3-0 GPIO[20] configuration (see -40h)
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-4Bh    R/W         bits 7-4 GPIO[23] configuration (see -40h)
                    bits 3-0 GPIO[22] configuration (see -40h)
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-4D     R/W         bit 7 unused
                    bits 6-4 = 001 select NMI interrupt for GPIO[24]
                             = nnn select IRQ[nnn] interrupt for GPIO[24] (nnn=2-3,5-7)
                    bit 3 = 1 enable pulldown on GPIO[24]
                    bit 2 = 1 enable pullup on GPIO[24]
                    bit 1 unused
                    bit 0 = 0 GPIO[24] is general purpose input
                          = 1 GPIO[24] is general purpose output
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-4E     R/W         bits 7-0 GPIO[25] configuration (see -4D)
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-4F     R/W         bits 7-0 GPIO[26] configuration (see -4D)
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