Timing Of The Ctsx Signal In Cyclic Sleep Mode 7; Timing Of The Rtsx Signal In Cyclic Sleep Mode 9; Figure 11: Timing Of Ctsx Signal (If Cfun= 7); Figure 12: Timing Of Rtsx Signal (If Cfun = 9) - Siemens AC75 Hardware Interface Description

AC75 Hardware Interface Description
Strictly confidential / Preliminary

3.6.2 Timing of the CTSx Signal in CYCLIC SLEEP Mode 7

Figure 11 illustrates the CTSx signal timing in CYCLIC SLEEP mode 7 (CFUN=7).
CTSx
st
1 character Last character
AT interface disabled
With regard to programming or using timeouts, the UART must take the varying CTS
inactivity periods into account.
3.6.3

Timing of the RTSx Signal in CYCLIC SLEEP Mode 9

In SLEEP mode 9 the falling edge of RTSx can be used to temporarily wake up the ME. In
this case the activity time is at least the time set with AT^SCFG="PowerSaver/Mode9/
Timeout",<psm9to> (default 2 seconds). RTSx has to be asserted for at least a dedicated
debounce time in order to wake up the ME. The debounce time specifies the minimum time
period an RTSx signal has to remain asserted for the signal to be recognized as wake up
signal and being processed. The debounce time is defined as 8*4.615 ms (TDMA frame
duration) and is used to prevent bouncing or other fluctuations from being recognized as
signals. Toggling RTSx while the ME is awake has no effect on the AT interface state, the
regular hardware flow control via CTS/RTS is unaffected by this RTSx behaviour.
Power saving
CTSx
RTSx
AT interface disabled
AC75_HD_V00.202
2 s
AT interface enabled

Figure 11: Timing of CTSx signal (if CFUN= 7)

Debounce Time
AT interface enabled

Figure 12: Timing of RTSx signal (if CFUN = 9)

Page 48 of 120
Beginning of power saving
0.9...2.7 s
Wake up of ME
2 s
37 ms
s
0.9...2.7 s
27.04.2006