MAX7652CCB datasheet(31/36 Pages) MAXIM

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Flash Programmable 12-Bit Integrated

Data-Acquisition Systems

______________________________________________________________________________________

Interrupt System

The MAX7651/MAX7652 has ten program-assist inter-

rupts that are either external or internal to the 8051 sys-

tem. Table 24 shows the SFR bit locations for interrupt

enable and priority control. Shaded Table regions

reflect the 8051 industry standard. Set SFR bit IE.7 high

to enable all interrupts. See the MAX7651/MAX7652

Programmer’s Reference Manual.

Timers

The MAX7651/MAX7652 feature several modes of tim-

ing control through the CKCON special function regis-

ter. Table 25 shows the CKCON SFR format. The

individual control bits can be used to set the number of

clock cycles needed (four or twelve) to increment each

timer/counter or the number of clock cycles needed to

execute the MOVX instruction. See the MAX7651/

MAX7652 Programmer’s Reference Manual for further

details.

Analog and Digital Supplies

The MAX7651/MAX7652 have multiple power-supply

inputs: one analog AVDD and three digital DVDD. The

pulse width modulators have their own power supply

inputs, PWMV and PWMG. Decouple all supply inputs

with a 0.1µF capacitor in parallel with a 10µF low ESR

capacitor, with both capacitors as close to the supply

pins as possible and with the shortest possible connec-

tion to the ground plane.

PARAMETER

MIN

MAX

COMMENTS

TPROGL

10TCK

TPROGL must equal TWRITE during lockbit writes

TASUW

3TCK

TWRITE

7TCK + 54

µs7TCK + 72µs

TADSUR

3TCK

TREAD

8TCK + 50ns

Read access time

TP27L

10TCK

TP27H

3TCK

TCK

83ns

250ns

Table 23

Note: P2.6, P2.7, P3.6, and P3.7 must also meet TASUW (min) timing specification.

PROGRAM LOCK

BITS

LB1

LB2

LB3

PROTECTION TYPE

No program lock features (Default after a mass erase)

MOVC instructions executed from external program memory are disabled from fetching code bytes

from internal memory, EA is sampled and latched on reset (RST), and further external data

programming of both FLASH arrays is disabled.

Verify (read) is disabled. (see Mode 2)

External execution is disabled (EA override, see Mode 3).

Table 24. Lock Bit Protection Modes

ADDRESS

DATA

MEANING

30H

7FH

JEDEC Continuation Byte

31H

CBH

Manufactured by Maxim

32H

20H

MAX7651/MAX7652

Table 25. MAX7651/MAX7652 Signature Bits

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