STPMC1 datasheet(59/77 Pages) STMICROELECTRONICS

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STPMC1

Theory of operation

Doc ID 15728 Rev 6

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9.20

Mode signals

The STPMC1 includes 12 Mode signals located in the DRP and DFP registers, some are

used for internal testing purposes while others are useful to change some of the operation of

the STPMC1. The mode signals are not retained when the STPMC1 supply is not available

and then they are cleared when a POR occurs, while they are not cleared when a remote

reset command (RRR) is sent through SPI.

The mode signal bit can be written using the normal writing procedure of the SPI interface

(see SPI section).

In the table below the commands to change mode signals are given.

RD mode signal has been already described in paragraph

9.19 but there is another implied

function of the signal RD. When it is set, each sense amplifier is disconnected from

corresponding antifuse element and this way, its 3 V NMOS gate is protected from the high

voltage of VOTP during permanent write operation. This means that as long as the VOTP

voltage reads more than 3 V, the signal RD should be set.

PUMP: when set, the PUMP mode signal transform the MOP and MON pins to act as

driving signals to implement a charge-pump DC-DC converter. This feature is useful in order

Address

Name

N. of

bits

Description

IMPORTANT: The decimal value indicated in this column represents

the value of the configuration bits with MSB in bold.

7-BIT

Binary

DEC

1101110

110

ENH

Fifth data input enable:

- ENH=0: Voltage#0=DAN,

- ENH=1: Voltage#0=DAH

1101111

111

CHK

Reserved – Must be always set to 1

Table 33.

Configuration bits map (continued)

Table 34.

Mode signals description

Bit pos.

76543210

Functional description of commands for changing system signals

(X, D, A = {0, 1})

D1110000

DRP

TSG0=D,

Controls the transmission latches when APL>1

D1110001

DRP

TSG1=D

Reserved

D1110010

DRP

TSG2=D

Reserved

D1110011

DRP

TSG3=D

Reserved

D1111000

DFP

BANK=D

Reserved

D1111001

DFP

PUMP=D

Charge pump mode of MOP:MON switch ON/OFF signal

D1111010

DFP

TST0=D

Reserved

D1111011

DFP

TST1=D

Reserved

D1111100

DFP

TST2=D

Reserved

D1111101

DFP

RD=D

Read disable of OTP block, CFG = (RD == 0)? OTP: shadow

D1111110

DFP

WE=D

Write enable, WE = 1 execute permanent write to OTP cell

X1111111

DFP

Precharge

Increments group data record pointer

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