Specifications

Flash Program Memory

13-9

’24x–’240x Family Compatibility

Table 13–5. Instructions for Entering and Exiting Flash Control Register Mode

Mode ’C2xx Instruction Description

Flash Array Access Mode IN Dummy, 0FF0Fh

Sets the Flash into normal run or operating

mode (i.e., Flash read)

(Note: Flash Control Registers are dis-

abled in this mode.)

Control Register Access Mode OUT Dummy, 0FF0Fh

Sets the Flash into control mode, ready for

Erase and Programming operations

(i.e., makes the Control registers visible)

(Note: Flash Array is disabled in this

mode.)

Note: The word “dummy” in the above two instructions indicate that the actual word written into (or read from) I/O address

FF0Fh is not important. Rather, it is the mere action of reading or writing from/to FF0Fh that puts the Flash in the appropri-

ate mode.

13.4.2 Flash Control Registers – Summary Table

Table 13–6 lists a set of control register that will be visible during Flash control

programming.