PIC16C770 Datasheet

IC型号：
PIC16C770
PDF描述：
18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-bit A/D
文件大小：
3585.57KB
PDF页数：
220页
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PIC16C717/770/771

4.0

PROGRAM MEMORY READ

(PMR)

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.

4.0.1

PMCON1 REGISTER

Program memory is readable during normal operation

(full V

range). It is indirectly addressed through the

Special Function Registers:

鈥?/div>

PMCON1

PMDATH

PMDATL

PMADRH

PMADRL

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.

R-1

Reserved

bit7

U-0

鈥?/div>

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

U-0

鈥?/div>

U-0

鈥?/div>

U-0

鈥?/div>

U-0

鈥?/div>

U-0

鈥?/div>

R/S-0

bit0

R = Readable bit

W = Writable bit

S = Settable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

bit 7:

bit 0:

Reserved:

Read as 鈥?鈥?/div>

RD:

Read Control bit

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

= Reserved

bit 6-1:

Unimplemented:

Read as '0'

4.0.2

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.

漏

1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 43

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