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ST7LITEU05 数据表(PDF) 25 Page - STMicroelectronics

部件名 ST7LITEU05
功能描述  8-bit MCU with single voltage Flash memory, ADC, timers
PDF  115 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST7LITEU05 数据表(HTML) 25 Page - STMicroelectronics

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REGISTER DESCRIPTION (Cont’d)
AVD THRESHOLD SELECTION REGISTER
(AVDTHCR)
Read/Write
Reset Value: 0000 0011 (03h)
Bits 7:5 = CK[2:0] internal RC Prescaler Selection
These bits are set by software and cleared by
hardware after a reset. These bits select the pres-
caler of the internal RC oscillator. See Figure 14
on page 26 and the following table and note:
Table 6. Internal RC Prescaler Selection bits
Note: If the internal RC is used with a supply oper-
ating range below 3.3V, a division ratio of at least 2
must be enabled in the RC prescaler.
Bits 4:2 = Reserved, must be kept cleared.
Bits 1:0 = AVD Threshold Selection bits. Refer to
Section 8.4 SYSTEM INTEGRITY MANAGE-
MENT (SI).
CLOCK
CONTROLLER
CONTROL/STATUS
REGISTER (CKCNTCSR)
Read/Write
Reset Value: 0000 1001 (09h)
Bits 7:4 = Reserved, must be kept cleared.
Bit 3 = AWU_FLAG AWU Selection
This bit is set and cleared by hardware
0: No switch from AWU to RC requested
1: AWU clock activated and temporization com-
pleted
Bit 2 = RC_FLAG RC Selection
This bit is set and cleared by hardware
0: No switch from RC to AWU requested
1: RC clock activated and temporization complet-
ed
Bit 1 = Reserved, must be kept cleared.
Bit 0 = RC/AWU RC/AWU Selection
0: RC enabled
1: AWU enabled (default value)
Table 7. Clock Register Map and Reset Values
70
CK2 CK1 CK0
0
0
0
AVD1 AVD0
CK2 CK1 CK0
fOSC
00
1
fRC/2
01
0
fRC/4
01
1
fRC/8
10
0
fRC/16
others
fRC
70
00
00
AWU_
FLAG
RC_
FLAG
0
RC/
AWU
Address
(Hex.)
Register
Label
76
54
3
2
1
0
0038h
MCCSR
Reset Value
-
0
-
0
-
0
-
0
-
0
-
0
MCO
0
SMS
0
0039h
RCCR
Reset Value
CR9
1
CR8
1
CR7
1
CR6
1
CR5
1
CR4
1
CR3
1
CR2
1
003Ah
SICSR
Reset Value
-
0
CR1
0
CR0
0
-
0
-
0
LVDRF
x
AVDF
0
AVDIE
0
003Eh
AVDTHCR
Reset Value
CK2
0
CK1
0
CK0
0
-
0
-
0
-
0
AVD1
1
AVD2
1
003Fh
CKCNTCSR
Reset Value
-
0
-
0
-
0
-
0
AWU_FLAG
1
RC_FLAG
0
-
0
RC/AWU
1
1



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