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3.10.7
Clocked-synchronous 8-bit SIO Mode Control
The following registers are used to control and monitor the operation status when the
serial bus interface (SBI) is being operated in clocked synchronous 8-bit SIO mode.
SBI0CR1
Bit symbol
(1240H)
Read/Write
After reset
Transfer
Function
Read-
start
modify-write
0: Stop
instruction is
1: Start
prohibited.
Note: Set the transfer mode and the serial clock after setting <SIOS> to "0" and <SIOINH> to "1".
SBI0DBR
Bit symbol
(1241H)
Read/Write
Read-
After reset
modify-write
instruction is
prohibited.
Serial Bus Interface 0 Control Register 1
7
6
5
SIOS
SIOINH
SIOM1
W
0
0
0
Continue/
Transfer mode select
abort
00: Transmit mode
transfer
01: (Reserved)
0: Continue
10: Transmit/receive mode
transfer
11: Receive mode
1: Abort
transfer
Serial Bus Interface 0 Data Buffer Register
7
6
DB7
DB6
DB5
Figure 3.10.20 Register for the SIO Mode
92CM22-190
4
3
SIOM0
0
Serial clock selection <SCK2:0> at write
n = 4
000
1.25 MHz
n = 5
001
625 kHz
n = 6
010
313 kHz
n = 7
011
156 kHz
n = 8
100
78.1 kHz
n = 9
101
39.1 kHz
110 n = 10 19.5 kHz
−
111
(External clock : SCK0)
Transfer mode selection
00
8-bit transmit mode
01
(Reserved)
10
8-bit transmit/receive mode
11
8-bit receive mode
Continue/abort transfer
0
Continue transfer
1
Abort transfer (Automatically cleared after transfer aborted)
Indicate transfer start/stop
0
Stop
1
Start
5
4
3
DB4
DB3
R (Receiver)/W (Transfer)
Undefined
TMP92CM22
2
1
SCK2
SCK1
W
0
0
Serial clock selection and reset monitor
System clock: f
SYS
= 20 MHz (SCL output to SCK pin)
f
SYS
f
SYS
fscl=
[Hz]
n
2
2
1
DB2
DB1
2007-02-16
0
SCK0
W
0
0
DB0
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