UM0934 datasheet(44/113 Pages) STMICROELECTRONICS

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Host interface

UM0934

44/113

Doc ID 17389 Rev 2

In the case of an NAK response from the external host, the ST7570 repeats the frame only

once after a delay corresponding to TWBC (wait before continue).

A missed response from the external host or a framing error when an ACK character is

awaited is considered as an acknowledgment.

5.2.3

Host interface timeouts

All the default values of host interface time-outs are reported in Table 14

5.3

Command codes

Each command frame exchanged between the host controller and the ST7570 carries a

command, identified by a unique command code (declared in the command code field as in

Figure 15

It is possible to distinguish three different commands types:

●

Request commands sent by the external host to use an ST7570 service

●

Confirm/Error commands sent by the ST7570 to answer a previous request command

●

Indication commands sent by the ST7570 to inform the external host of a change on its

services; these are unsolicited commands not following any request.

Table 15

lists all the available commands, grouped according to the different types of

services offered by the ST7570.

Table 14.

Host interface timeout values

Timeout

Default value [ms]

TACK

TPOLL

TSR

200

TWBC

TIC

Table 15.

List of available command codes

Group

Command

Code

Synchronization

CMD_SynchroIndication

10h

CMD_DesynchroRequest

11h

CMD_SynchroStatus

85h

Reset

CMD_ResetRequest

21h

MIB

CMD_WriteDBRequest

41h

CMD_WriteDBConfirm

42h

CMD_WriteDBError

43h

CMD_ReadDBRequest

90h

CMD_ReadDBConfirm

91h

CMD_ReadDBError

92h

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