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DPC31 HW

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DPC31 HW Description

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watchdog’ is implemented in DPS. This timer can be enabled or disabled any time via the request interface

(DPS_User WD, Enable; or DPS_User WD, Disable).

Note: In the case of the SPC3, the processor is monitored via a counter.

The DPS_User_Watchdog is an internal 16bit RAM cell that is started by a user-parameterized value

’DPS_User WD Value

15..0

’, and is decremented every 10 msec. If the timer reaches the value ’0000h’, DPS

does the following: it executes ‘Leave_Master’, locks the DPS_User WD, and enters the event

‘DPS_User_WD Expired’ in the Indication_Queue.

The user has to cyclically set this timer to its initial value. To do this, the user must transfer ’DPS_User WD,

Reset’ via the request interface. DPS then reloads the timer to the parameterized value ’DPS_User WD

Value

15..0

’.

With ‘DPS_USER WD, Enable’ request, the DPS_User WD is automatically set to its initial valu and started.

5.2.6 Global_Control (SAP58)

The MAC accepts the Global_Control message only in the ‘Data_Exchange’ mode and only from

‘Master_Add’. Under all other instances, the service is ignored. If more than two net data bytes

(Control_Command, Group_Select) are received (refer to Table 5.2-10) or if there is no indication buffer,

DPS also does not accept this service.

76543210Byte Name

0-5: Buffer Header

Res. Res. Sync Unsync Freeze Unfreeze Clear_

Data

Res.

6: Control_Command

7: Group_Select

Table 5.2-10:

Data Format of the Global_Control Message

The parameter Group_Select establishes which group(s) is(are) to be addressed. The Global_Control

message becomes effective if the bit by bit AND operation of the Group_Ident, transferred in the

Set_Parameter message, with the Group_Select parameter supplies a value unequal to 0 on at least one bit

position. If Group_Select is equal to 0, all slaves are addressed.

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