Datasheet

Table 2. CPU Ports

MAX1464 Low-Power, Low-Noise Multichannel

Sensor Signal Processor

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ADDRESS REF FUNCTION

0h–Ch P0–PC

General-Purpose Ports. These ports, P0–PC, can be used to hold intermediate calculation results,

often-used calculation coefcients, loop counter values, event counter values, comparison limit values,

etc.

Dh PD

Module Data Port. This port is used to transfer data to and from the various functional modules in

the MAX1464. Data loaded into PD can be transferred to the data, conguration, or control register

of any of the functional modules. The data transfer is initiated using the module control port (PF). The

contents of PD are not changed during module write operations, but are overwritten by module read

operations.

Eh PE

Module Address Port. This port is used to address a module register. A module address is loaded into

PE prior to initiating a data transfer or control function in the module control port. All modules in the

MAX1464 are accessed through this indirect addressing method. The contents of PE are not changed

by the read or write operations to module registers. Only the lower 8 bits are used. The upper 8 bits are

not decoded.

Fh PF

Module Control Port. This port initiates an operation on the module addressed by PE. Data can

be written to, or read from, module registers. Specic bits are assigned in the module control port to

initiate operations on the MAX1464 modules:

Bit 15 (CTRL): 1 = Initiate action dened in bit 14, 0 = no action initiated. Autoreset to zero after

operation is completed.

Bit 14 (RD/WR): 1 = read data, 0 = write data.

Bits 13–0: Not decoded.