L9779WD datasheet(123/170 Pages) STMICROELECTRONICS

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L9779WD

Functional description

169

REQUHI (upstream data block8, read command: RD_DATA8)

REQUHI

REQUEST HI

Address:

Type:

Reset:

1100 0000b (reset source: RST_UV, Bit 4 additionally RST_PRL)

43210

RESP_CNT1

RESP_CNT0

RESP_ERR

RESP_Z0

CHRT

W_RESP

NO_RESP

RESP_TO_EAR

[7-6] RESP_CNT(1-0):

Counter for receiving the 4 response bytes

[5] RESP_ERR:

'1': 1 byte of the 32-bit response is incorrect (1)

1. Sequencer-run: A sequencer-run is initiated by the writing of a complete response (RESP_BYTE3…RESP_BYTE0) or by

writing of a response-time <RESPTIME> or by reaching the end of a time window. In case WDA reference time base

(1/f_clk) has to be changed to f_clk = 39 kHz, CONFIG6 bit1 has to be written to 0 before sequencer-run is started.

[4] RESP_Z0:

'1': Controller set response-time to 0ms; a correct response within the time window

nevertheless increments the error counter by one '0': Response-time is greater than 0ms

[3] CHRT:

'1': Controller has changed response-time; reset to zero after a read access and after the next

sequencer run

[2] W_RESP:

'1': in case of incorrect response in value; reset to zero at sequencer-run (1)

[1] NO_RESP:

'1': in case of no response at all; timer is restarted automatically; reset to zero after a read

access

[0] RESP_TO_EARLY:

'1': Response before time window was opened; reset to zero at sequencer-run (1)

RESP_TO_EARLY = '1':

monitoring module has received a response before beginning of the time window and

therefore this was rejected. Reception of a response means "end of reception of

RESP_BYTE0" after the other response bytes (i.e. RESP_BYTE3, RESP_BYTE2,

RESP_BYTE1 - in this order!) have been received.

NO_RESP = '1':

monitoring module has received no response at all or a response too late after the

time window already closed. However, a response too late might be read as

RESP_TO_EARLY, as too late a response is at the same time too early a response

concerning the next WDG cycle. This results in the NO_RESP monitoring being

overwritten by a RESP_TO_EARLY monitoring.

This means that no "end of reception of RESP_BYTE0" was detected before the end

of the time window - neither during the time window nor before beginning of the time

window. (Remember: RESP_BYTE0 is the last of four response bytes!)

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