UPSD3422EB40U6 datasheet(252/300 Pages) STMICROELECTRONICS

252 / 300 page

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PSD module

UPSD3422, UPSD3433, UPSD3434, UPSD3454

252/300

assembly code example in Table , the PFQ will be loaded with the final instructions to

command the MCU module to Power Down mode after the PDS Module goes to Power-

Down mode. In this case, even though the code memory goes off-line in the PSD module,

the last few MCU instruction are sourced from the PFQ.

Forced power-down example

Figure 88.

Automatic power-down (APD) unit

PDOWN:

ANL

A8h, #7Fh

; disable all interrupts

ORL

9Dh, #C0h

; ensure PFQ and BC are enabled

MOV

DPTR, #xxC7 ; load XDATA pointer to select PMMR3 register (xx = base

; address of csiop registers)

CLR

; clear A

JMP

LOOP

; first loop - fill PFQ/BQ with Power Down instructions

NOP

; second loop - fetch code from PFQ/BC and set Power-

; Down bits for PSD module and then MCU module

LOOP:

MOVX

@DPTR, A

; set FORCE_PD Bit in PMMR3 in PSD module in second

; loop

MOV

87h, A

; set PD Bit in PCON register in MCU module in second

; loop

MOV

A, #02h

; set power-down bit in the A register, but not in PMMR3 or

; PCON yet in first loop

JMP

LOOP

; uPSD enters into Power-Down mode in second loop

PMMR0, BIT 1 (APD EN)

8032 ALE

PSD MODULE RST_

CSI (pin PD2)

CLKIN (pin PD1)

PDN

OMC OUTPUTS

FSx

CSBOOTx

RS0

CSIOP

8032 DATA FROM MCU MODULE

8032 ADDR FROM MCU MODULE

PDN

CSI

PMMR3, BIT 1 (FORCE_PD)

ENABLE

1 = FOUND

TRANSITION

1 = FOUND

EDGE

CLEAR

FULL

COUNT

DPLD CHIP

SELECT

EQUATIONS

GPLD

TRANSITION

DETECTION

EDGE

DETECTION

4-BIT APD

UP-COUNTER

ENABLE

CLK

1 = POWER

DOWN MODE

ENABLE

PSD

MODULE

LINE

BUFFERS

8032 DATA

8032 ADDR

WHEN CSI FUNCTION IS SPECIFIED IN PSDSOFT EXPRESS,

CSI IS PART OF EQUATIONS FOR FSx, CSBOOTx, RS0, and CSIOP

AI06608B

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