ST7LITE20F2 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST7LITE20F2
STMicroelectronics
'ST7LITE20F2' PDF : 170 Pages View PDF
Power saving modes
ST7LITE20F2 ST7LITE25F2 ST7LITE29F2
AWUF prescaler register list (AWUPR)
Read / Write
Reset value: 1111 1111 (FFh)
Bit
7
−
−
−
−
−
−
0
Value AWUPR7 AWUPR6 AWUPR5 AWUPR4 AWUPR3 AWUPR2 AWUPR1 AWUPR0
● Bits 7:0= AWUPR[7:0] Auto-wakeup prescaler
These 8 bits define the AWUPR dividing factor (as explained in Table 19: AWU
prescaler below):
Table 19. AWU prescaler
AWUPR[7:0]
00h
01h
−
FEh
FFh
Dividing factor
Forbidden
1
−
254
255
In AWU mode, the period that the MCU stays in HALT mode (tAWU in Figure 29: AWUF halt
timing diagram) is defined by:
tAWU
=
64
×
AWUPR
×
---------1-----------
fAWURC
+
tRCSTRT
Note:
This prescaler register can be programmed to modify the time that the MCU stays in HALT
mode before waking up automatically.
If 00h is written to AWUPR, depending on the product, an interrupt is generated immediately
after a HALT instruction, or the AWUPR remains unchanged.
Table 20. AWU register map and reset values
Address
(Hex.)
Register
label
7
6
5
4
3
2
1
0
0049h
004Ah
AWUPR
Reset value
AWUCSR
Reset value
AWUPR AWUPR AWUPR AWUPR AWUPR AWUPR AWUPR AWUPR
1
1
1
1
1
1
1
1
0
0
0
0
0
AWUF AWUM AWUEN
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Doc ID 8349 Rev 5
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