ST6240B datasheet(54/76 Pages) STMICROELECTRONICS

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ST62T40B/E40B

POWER SUPPLY SUPERVISOR (Continued)

4.6.2 PSS Register

The PSS register permits control over the PSS de-

vice. The register can be addressed in the data

space as a RAM location at DAh. This register is

cleared after Reset.

PSS Status Control Register (PSSCR)

Address: DAh - Read/Write

Bit 7 = PIF. Interrupt flag bit. This bit is the interrupt

flag. This bit is set (resp. cleared) as soon as the

equality between nxVPSS and mxVDD/13 (resp.

(m+1)xVDD/13) occurs.

Bit 6 = PEI. Interrupt mask bit. This bit is the au-

thorization bit of the interrupt request: – If PEI is

set, the interrupt request can reach the Core. – If

PEI is cleared, the interrupt request cannot reach

the Core.

Bits 5-4 = PDV1, PDV0. Division rate selection bit.

The PDV1/0 bits are used to select the rate of divi-

sion

the

VDD

voltage

(mxVDD/13

(m+1)xVDD/13, according to the hysteresis).

Table 24. VDDVoltage division rate selection

bits

Bits 3-1 = PDR2, PDR1, PDR0. Division rate se-

lection bit. The PDR2/1/0 bits are used to inhibit

the PSS device and to select the division rate of

the PSS voltage (nxVPSS/13).

Bit 0 = D0. The PSS comparator output is valid 8

cycle times after the programming of the PDR2/1/0

bits. It is forced to zero in the meantime.

Table 25. PSS Voltage division rate selection bits

PIF

PEI

PDV1

PSS

PDV0

PSS

PDR2

PSS

PDR1

PSS

PDR0

PSS

PDV1

PDV0

mxVDD/13

(m+ 1) xVDD/13

3xVDD/13

4xVDD/13

5xVDD/13

6xVDD/13

7xVDD/13

8xVDD/13

PDR2

PDR1

PDR0

PSS State

nxVPSS/13

IDLE

BUSY

4xVPSS/13

BUSY

5xVPSS/13

BUSY

6xVPSS/13

BUSY

7xVPSS/13

BUSY

VPSS

626

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