25CSM04 datasheet(39/55 Pages) MICROCHIP

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DS20005817D-page 39

25CSM04

10.3

Reading the Memory Partition

Registers

The contents of the Memory Partition registers can be

read with the Read Memory Partition Register (RMPR)

instruction. Their contents can be read irrespective of

the FMPC bit in the STATUS register.

To determine the MPR contents, first the device must

be selected with the CS line and then the opcode 31h

must be clocked into the device on the SI line, followed

by the 24-bit Memory Partition register address.

The address for each Memory Partition register is

embedded into the first address byte sent to the device,

in bit positions A18 through A16 (see Table 10-3). The

device will then begin to clock data out on the SO line.

Only one MPR can be read at a time. This sequence is

depicted in Figure 10-6.

FIGURE 10-6:

READ MEMORY PARTITION REGISTER (RMPR) SEQUENCE

SCK

2 34

567

910 11 12

00 110 0

0 1

RMPR Opcode (31h)

Address Bits A23-A0(1)

XXXX X A18

MSb

High-Impedance

MSb

D7 D6 D5 D4 D3 D2 D1 D0

MPR Value

Note 1: Address bits A23-A19 and A15-A0 are ignored.

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