ST7FOXA0 Datasheet, PDF (52/123 Pages) STMicroelectronics – 8-bit MCU with single voltage Flash memory

Power saving modes
ST7FOXA0
7.5.3
AWUFH Prescaler Register (AWUPR)
Reset value: 1111 1111 (FFh)
7
0
AWUPR7 AWUPR6 AWUPR5 AWUPR4 AWUPR3 AWUPR2 AWUPR1 AWUPR0
Read / Write
Bits 7:0= AWUPR[7:0] Auto wakeup Prescaler
These 8 bits define the AWUPR Dividing factor (see Table 11).
Table 11. Configuring the dividing factor
t(s) ^AWUPR[7:0]
Dividing factor
c 00h
Forbidden
du ^01h
1
ro ...
...
P _FEh
254
te _FFh
255
ole In AWU mode, the time during which the MCU stays in Halt mode, t_AWU, is given by the
s _{equation below. See also Figure 24 on page 49.}
roduct(s) ^{- Ob Note:}
t_AWU
=
64
×
AWUPR
×
---------¹-----------
f_AWURC
+
t_RCSTRT
The AWUPR prescaler register can be programmed to modify the time during which the
MCU stays in Halt mode before waking up automatically.
If 00h is written to AWUPR, the AWUPR remains unchanged.
P _{Table 12. AWU register mapping and reset values}
te _{Address Register}
le (Hex.)
label
7
6
5
4
so _AWUCSR
b_{0048h Reset}
0
0
0
0
O Value
3
2
1
0
0
AWUF AWUM AWUEN
0049h
AWUPR
Reset
Value
AWUPR7 AWUPR6 AWUPR5 AWUPR4 AWUPR3 AWUPR2 AWUPR1 AWUPR0
1
1
1
1
1
1
1
1
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