Maxim Integrated High-Speed Microcontroller Users Guide: Network Microcontroller Supplement - Manual (Page 209)

High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
209
rom_task_switch_out
The rom_task_switch_out function is called before a task is suspended (either voluntarily because it waits for an event or because its
timeslice is over). The DS80C400 silicon software implementation of this function saves the task’s state (stack and SFRs) to the state
buffer. This function is exported by the DS80C400 silicon software, and also serves as the default taskswitchout in the function redi-
rect table. Note: It returns ACC ! = 0. The rom_task_switch_in function returns to the caller of this function with ACC = 0. The para-
meters passed to rom_task_switch_in are defined as follows.
1-WIRE MASTER
OWM_First
The OWM_First function searches for the first 1-Wire device on the network and, if found, places the 8-byte unique ROM ID in the
OWM_ROMID buffer. A pointer to the OWM_ROMID buffer is provided in the ROM export table.
OWM_Next
The OWM_Next function searches for the next 1-Wire device on the network based upon the last known search ROM discrepancy and,
if found, places the 8-byte unique ROM ID in the OWM_ROMID buffer. A pointer to the OWM_ROMID buffer is provided in the ROM
export table.
OWM_Reset
The OWM_Reset function performs a 1-Wire reset on the network and returns device presence and line-short conditions.
OWM_Byte
The OWM_Byte function performs eight 1-Wire bit timeslots on the network and returns the response.
OWM_ROMID
OWM_ROMID is a memory buffer where 8-byte address (unique ROM ID) is stored after successful OWM_First or OWM_Next func-
tion call. A pointer to the
OWM_ROMID buffer is provided in the ROM export table. The 8-byte returned address is stored as follows:
@OWM_ROMID+0: Family Code
@OWM_ROMID+1: LSByte of 6-byte serial number
@OWM_ROMID+2: LSByte+1 of 6-byte serial number
@OWM_ROMID+3: LSByte+2 of 6-byte serial number
@OWM_ROMID+4: LSByte+3 of 6-byte serial number
@OWM_ROMID+5: LSByte+4 of 6-byte serial number
@OWM_ROMID+6: MSByte of 6-byte serial number
@OWM_ROMID+7: CRC
INPUT DESCRIPTION OUTPUT DESCRIPTION
ACC byte to transmit ACC byte received
INPUT DESCRIPTION OUTPUT DESCRIPTION
— ACC
line shorted (=00h)
presence detected (=01h)
no presence detected (=03h)
INPUT DESCRIPTION OUTPUT DESCRIPTION
— ACC
next device found (=01h)
otherwise (=00h)
INPUT DESCRIPTION OUTPUT DESCRIPTION
— ACC
device found (=01h)
otherwise (=00h)
INPUT DESCRIPTION OUTPUT DESCRIPTION
DPTR0 TCB of task to be switched in User-defined
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