Rainbow Electronics MAX6963 - Manual (Page 16)

MAX6960–MAX6963
4-Wire Serially Interfaced
8 x 8 Matrix Graphic LED Drivers
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basis (updates all MAX6960s), according to the status
of the local/global bit (Table 9). The local/global bit is
ignored during a 16-bit read transmission, and the
MAX6960 pointed to by the global driver indirect
address register is read.
Register Address Autoincrementing
When a read or write is indirected through the global dri-
ver indirect address register, the 16-bit command can
choose whether the global driver indirect address is
autoincremented after the command has been executed.
This allows the host to set up one or more registers in
consecutive MAX6960s with the display indirect address,
autoincrementing only when required (Table 10).
Driver Address Register
Reading the driver address register (Table 11) returns
the driver address that has been assigned to a particu-
lar MAX6960. The order of the driver addresses is
determined purely by the order that the 3-wire interface
is daisy-chained through multiple MAX6960s. The reg-
ister is used to detect the presence of a MAX6960 at an
address, and a binary search on the 256 possible
addresses can be used to determine the size of an
array of MAX6960s.
COMMAND ADDRESS
REGISTER
ADDRESS
CODE
(HEX)
D15 D14 D13 D12 D11 D10 D9 D8
LOCAL: Only the MAX6960 indirected by driver
indirect address is written.
0 X 0 X X X X X
GLOBAL: All MAX6960s are written with the same
data.
0 X 1 X X X X X
LOCAL: The MAX6960 indirected by driver indirect
address responds.
1 X 0 X X X X X
GLOBAL: The MAX6960 configured to address 0x00
responds.
0x00 to
0x07
1 X 1 X X X X X
GLOBAL: All MAX6960s are written with the same
data.
0 X X X X X X X
GLOBAL: The MAX6960 configured to address 0x00
responds.
0x08 to
0x0F
1 X X X X X X X
Table 9. Register Address Local/Global Control Bit Format
COMMAND ADDRESS
REGISTER
ADDRESS
CODE
(HEX)
D15 D14 D13 D12 D11 D10 D9 D8
Driver indirect address is not changed X 0 X X X X X X
Driver indirect address is incremented after read/write
0x00 to
0x07 X 1 X X X X X X
Driver indirect address is not changed 0x08 to X X X X X X X X
Table 10. Register Address Autoincrement Control Bit Format
REGISTER DATA
REGISTER
ADDRESS
CODE
(HEX)
D7 D6 D5 D4 D3 D2 D1 D0
Driver address 0x00 MSB 8-bit driver address 0x00 to 0xFF LSB
Table 11. Driver Address Register Format