TMP88CS38 datasheet(101/226 Pages) TOSHIBA

101 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-101

(5) Restart

Restart is used to change the direction of data transfer between a master device and

a slave device during transferring data. The following explains how to restart a serial

bus interface circuit.

Clear “0” to the MST, TRX and BB and set “1” to the PIN. The SDA pin retains the

high level and the SCL pin is released. Since a stop condition is not generated on a bus,

a bus is assumed to be in a busy state from other devices. Test the BB until it becomes

“0” to check that the SCL pin a serial bus interface circuit is released. Test the LRB

until it becomes “1” to check that the SCL line on a bus is not pulled down to the low

level by other devices. After confirming that a bus stays in a free state, generate a start

condition with procedure (2).

In order to meet setup time when restarting, take at least 4.7

μs of waiting time by

software from the time of restarting to confirm that a bus is free until the time to

generate a start condition.

Note:

When restarting after receiving in master receiver mode, because the divice doesn’t

send an acknowledgement as a last data, the level of SCL line can not be

conrirmied by reading LRB. Therefore, confirm the status of SCL line by reading

P5PRD register.

Figure 2.9.18 Timing Diagram when Restarting

Start condition

SDA (Pin)

SCL (Pin)

“0”

→ MST

“0”

→ TRX

“0”

→ BB

“1”

→ PIN

SCL (Bus)

LRB

“1”

→ MST

“1”

→ TRX

“1”

→ BB

“1”

→ PIN

4.7

μs (Min)

TMP88CS38 Datasheet(PDF) 101 Page - Toshiba Semiconductor

TMP88CS38 Datasheet(HTML) 101 Page - Toshiba Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL