SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 403

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

SYSCON1
System Control Reg.1
Bit
SLEEPCON
Note: SYSCON1 is write protected after the execution of EINIT unless it is released via
21.3
The microcontroller can be switched to Power Down mode to reduce the power
consumption to a minimum. Clocking of all internal blocks is stopped (RTC and oscillator
optionally); but, the contents of the internal RAM are preserved through the voltage
supplied via the
mode can be terminated by an external hardware reset only (by asserting low level on
the RSTIN pin). This reset will initialize all SFRs and ports to their default state, but will
not change the contents of the internal RAM.
There are two levels of protection against unintentionally entering Power Down mode.
First, the PWRDN (Power Down) instruction used to enter this mode has been
implemented as a protected 32-bit instruction. Second, this instruction is effective only
if the NMI (Non Maskable Interrupt) pin is externally pulled low while the PWRDN
instruction is executed. The microcontroller will enter Power Down mode after the
PWRDN instruction is completed.
This feature can be used in conjunction with an external power failure signal which pulls
the NMI pin low when a power failure is imminent. The microcontroller will enter the NMI
trap routine which can save the internal state into RAM. After the internal state has been
saved, the trap routine may then execute the PWRDN instruction. If the NMI pin is still
low at this time, Power Down mode will be entered; otherwise, program execution
continues.
The initialization routine (executed upon reset) can check the reset identification flags in
register WDTCON to determine whether the controller was initially switched on, or
whether it was properly restarted from Power Down mode.
User’s Manual
15
-
-
the unlock sequence (see
14
-
-
Power Down Mode
13
-
-
Function
SLEEP Mode Configuration (mode entered upon the IDLE instruction)
00:
01:
10:
11:
V
12
DD
-
-
Normal IDLE mode
SLEEP mode, with RTC running
Reserved.
SLEEP mode, with RTC and oscillator stopped
pins. The watchdog timer is stopped in Power Down mode. This
11
-
-
10
-
-
Table
ESFR (F1DC
9
-
-
21-6).
8
-
-
21-7
7
-
-
H
/EE
6
-
-
H
)
5
-
-
4
-
-
Power Management
Reset Value: 0000
C164CM/C164SM
3
-
-
2
-
-
Derivatives
V1.0, 2002-02
SLEEP
1
CON
rw
0
H