ST92141 datasheet(76/179 Pages) STMICROELECTRONICS

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ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)

5.7 STOP MODE

Under control of the Wake-up Interrupt Manage-

ment Unit (WUIMU), the Reset/Stop Manager can

also stop all oscillators without resetting the de-

vice.

In Stop Mode all context information will be pre-

served. During this condition the internal clock will

be frozen in the high state.

Stop Mode is entered by programming the WUIMU

registers (See “WAKE-UP / INTERRUPT LINES

MANAGEMENT UNIT (WUIMU)” on page 55.). An

active transition on an External Wake Up line, exits

the chip from Stop Mode and the MCU resumes

execution

after a

delay

of between

10239

CLOCK2 periods and 10239 CLOCK2 periods

plus the Oscillator Start Up Time.

On exiting from Stop mode an interrupt is generat-

ed and the EX_STP bit in CLK_FLAG will be set,

to indicate to the user program that the machine is

exiting from Stop mode.

Table 18. Internal Registers Reset Values

Number

System Register

Reset Value

Page 0 Register

Reset Value

(SSPLR)

undefined

Reserved

(SSPHR)

undefined

(SPICR)

00h

(USPLR)

undefined

(SPIDR)

undefined

(USPHR)

undefined

(WCR)

7Fh

(MODER)

E0h

(WDTCR)

12h

(Page Ptr)

undefined

(WDTPR)

undefined

(Reg Ptr 1)

undefined

(WDTLR)

undefined

(Reg Ptr 0)

undefined

(WDTHR)

undefined

(FLAGR)

undefined

(NICR)

00h

(CICR)

87h

(EIVR)

x2h

(PORT5)

FFh

(EIPLR)

FFh

(PORT4)

FFh

(EIMR)

00h

(PORT3)

FFh

(EIPR)

00h

(PORT2)

FFh

(EITR)

00h

(PORT1)

FFh

Reserved

(PORT0)

FFh

Reserved

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