PIC16LC771 datasheet(41/224 Pages) MICROCHIP

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DS41120C-page 41

PIC16C717/770/771

4.0

PROGRAM MEMORY READ

(PMR)

Program memory is readable during normal operation

(full VDD range). It is indirectly addressed through the

Special Function Registers:

•PMCON1

•PMDATH

•PMDATL

• PMADRH

• PMADRL

When interfacing the program memory block, the

PMDATH & PMDATL registers form a 2-byte word,

which holds the 14-bit data. The PMADRH & PMADRL

registers form a 2-byte word, which holds the 12-bit

address of the program memory location being

accessed. Mid-range devices have up to 8K words of

program EPROM with an address range from 0h to

3FFFh. When the device contains less memory than

the full address range of the PMADRH:PMARDL regis-

ters, the Most Significant bits of the PMADRH register

are ignored.

4.1

PMCON1 REGISTER

PMCON1 is the control register for program memory

accesses.

Control bit RD initiates a read operation. This bit cannot

be cleared, only set, in software. It is cleared in hard-

ware at completion of the read operation.

PROGRAM MEMORY READ CONTROL REGISTER 1 (PMCON1: 18Ch)

4.2

PMDATH AND PMDATL

REGISTERS

The PMDATH:PMDATL registers are loaded with the

contents of program memory addressed by the

PMADRH and PMADRL registers upon completion of a

Program Memory Read command.

R-1

U-0

R/S-0

Reserved

—

—RD

bit 7

bit 0

bit 7

Reserved: Read as ‘1’

bit 6-1

Unimplemented: Read as '0'

bit 0

RD: Read Control bit

= Initiates a Program memory read (read takes 2 cycles). RD is cleared in hardware.

= Reserved

Legend:

S = Settable (cleared in hardware)

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

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