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