Toshiba TLCS-870/C1 Series Manual page 284

18. Serial Bus Interface (SBI)
18.4 Functions
Table 18-2 States of the SCL0 and SDA0 Pins in the Acknowledgment Mode
Mode
Master
Slave
18.4.4 Serial clock
18.4.4.1 Clock source
mode.
During the data transfer after the slave address match is detected or a "GENERAL CALL" is
received in the transmitter mode, the SDA0 pin is released to receive an acknowledge signal
from the receiver during the period of the clocks for an acknowledge signal.
In the receiver mode, the SDA0 pin is pulled down to the low level and an acknowledge sig-
nal is generated. Table 18-2 shows the states of the SCL0 and SDA0 pins in the acknowledg-
ment mode.
Note: In the non-acknowledgment mode, the clocks for an acknowledge signal are not generated or counted,
and thus no acknowledge signal is output.
Pin Condition
SCL0
SDA0
SCL0
When the slave address
match is detected or a
"GENERAL CALL" is
received
SDA0
During transfer after the
slave address match is
detected or a "GEN-
ERAL CALL" is received
SBI0CR1<SCK> is used to set the HIGH and LOW periods of the serial clock to be output in the master
SCK
000:
001:
010:
011:
100:
101:
110:
111:
Transmitter
Add the clocks for an
-
acknowledge signal.
Release the pin to receive an
-
acknowledge signal
Count the clocks for an
-
acknowledge signal
-
Release the pin to receive an
acknowledge signal
t (m/fcgck) t
HIGH LOW
m
9
11
15
23
39
71
135
263
Receiver
Add the clocks for an acknowl-
edge signal
Output the low level as an
acknowledge signal to the pin
Count the clocks for an
acknowledge signal
Output the low level as an
acknowledge signal to the pin
Output the low level as an
acknowledge signal to the pin
(n/fcgck)
n
12
14
18
26
42
74
138
266
TMP89FM42