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| 型號： | ST7PLITE02F0U6TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, QCC20 |
| 封裝： | QFN-20 |
| 文件頁數(shù)： | 45/125頁 |
| 文件大小： | 1956K |
| 代理商： | ST7PLITE02F0U6TR |
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ST7LITE0x, ST7LITESx
26/125
Figure 12. PLL Output Frequency Timing
Diagram
When the PLL is started, after reset or wakeup
from Halt mode or AWUFH mode, it outputs the
clock after a delay of tSTARTUP.
When the PLL output signal reaches the operating
frequency, the LOCKED bit in the SICSCR register
is set. Full PLL accuracy (ACCPLL) is reached after
Refer to section 8.4.4 on page 37 for a description
of the LOCKED bit in the SICSR register.
7.3 REGISTER DESCRIPTION
MAIN CLOCK CONTROL/STATUS REGISTER
(MCCSR)
Read / Write
Reset Value: 0000 0000 (00h)
Bits 7:2 = Reserved, must be kept cleared.
Bit 1 = MCO Main Clock Out enable
This bit is read/write by software and cleared by
hardware after a reset. This bit allows to enable
the MCO output clock.
0: MCO clock disabled, I/O port free for general
purpose I/O.
1: MCO clock enabled.
Bit 0 = SMS Slow Mode select
This bit is read/write by software and cleared by
hardware after a reset. This bit selects the input
clock fOSC or fOSC/32.
0: Normal mode (fCPU = fOSC
1: Slow mode (fCPU = fOSC/32)
RC CONTROL REGISTER (RCCR)
Read / Write
Reset Value: 1111 1111 (FFh)
Bits 7:0 = CR[7:0] RC Oscillator Frequency Ad-
justment Bits
These bits must be written immediately after reset
to adjust the RC oscillator frequency and to obtain
an accuracy of 1%. The application can store the
correct value for each voltage range in EEPROM
and write it to this register at start-up.
00h = maximum available frequency
FFh = lowest available frequency
Note: To tune the oscillator, write a series of differ-
ent values in the register until the correct frequen-
cy is reached. The fastest method is to use a di-
chotomy starting with 80h.
Table 5. Clock Register Map and Reset Values
70
00
MCO
SMS
4/8 x
freq.
LOCKED bit set
tSTAB
tLOCK
input
Ou
tp
u
tfr
e
q
.
tSTARTUP
t
70
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
Address
(Hex.)
Register
Label
76543
210
0038h
MCCSR
Reset Value
00000
0
MCO
0
SMS
0
0039h
RCCR
Reset Value
CR7
1
CR6
1
CR5
1
CR4
1
CR3
1
CR2
1
CR1
1
CR0
1
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