ATA6020N ATMEL Corporation, ATA6020N Datasheet - Page 46

• Manufacturer Part Number: ATA6020N
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

46
ATA6020N
Changing the directional mode (TX/RX) should not be performed during the transfer of an MCL
telegram. One should wait until the end of the telegram which can be detected using the SSI
interrupt (IFN = 1) or by interrogating the ACT status.
A 9-bit telegram, once started will always run to completion and will not be prematurely termi-
nated by the SIR bit. So, if the SIR-bit is set to “1” in with telegram, the SSI will complete the
current transfer and terminate the dialog with an MCL stop condition.
Figure 5-27. Example of MCL Transmit Dialog
Figure 5-28. Example of MCL Receive Dialog
(IFN = 0)
(IFN = 1)
(IFN = 0)
(IFN = 1)
Interrupt
Interrupt
Interrupt
Interrupt
SRDY
SRDY
ACT
SDD
ACT
SDD
SIR
SIR
SC
SD
SD
SC
Write STB
Write STB
(tx data 1)
(tx data 1)
Start
Start
msb
7 6 5 4 3 2 1
msb
7 6 5 4 3 2 1
tx data 1
tx data 1
lsb
lsb
0 A
0 A
Write STB
(tx data 2)
msb
msb
7 6 5 4 3 2 1 0 A
7 6 5 4 3 2 1 0 A
rx data 2
tx data 2
lsb
lsb
Stop
4708D–4BMCU–09/05
Stop
Read SRB
(rx data 2)