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参数资料
| 型号： | ST7PLITEUS5U3TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, DSO8 |
| 封装： | LEAD FREE, DFN-8 |
| 文件页数： | 18/108页 |
| 文件大小： | 1957K |
| 代理商： | ST7PLITEUS5U3TR |
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ST7LITEUSx
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6 SUPPLY, RESET AND CLOCK MANAGEMENT
The device includes a range of utility features for
securing the application in critical situations (for
example in case of a power brown-out), and re-
ducing the number of external components.
Main features
■ Clock Management
– 8 MHz internal RC oscillator (enabled by op-
tion byte)
– External Clock Input (enabled by option byte)
■ Reset Sequence Manager (RSM)
■ System Integrity Management (SI)
– Main supply Low voltage detection (LVD) with
reset generation (enabled by option byte)
– Auxiliary Voltage detector (AVD) with interrupt
capability for monitoring the main supply
6.1 INTERNAL RC OSCILLATOR ADJUSTMENT
The ST7 contains an internal RC oscillator with a
specific accuracy for a given device, temperature
and voltage. It can be selected as the start up
clock through the CKSEL[1:0] option bits (see sec-
tion 14.1 on page 95). It must be calibrated to ob-
tain the frequency required in the application. This
is done by software writing a 10-bit calibration val-
ue in the RCCR (RC Control Register) and in the
bits [6:5] in the SICSR (SI Control Status Regis-
ter).
Whenever the microcontroller is reset, the RCCR
returns to its default value (FFh), i.e. each time the
device is reset, the calibration value must be load-
ed in the RCCR. Predefined calibration values are
stored in Flash memory for 3.3 and 5V VDD supply
voltages at 25°C, as shown in the following table.
1. DEE0h, DEE1h, DEE2h and DEE3h are located
in a reserved area but are special bytes containing
also the RC calibration values which are read-ac-
cessible only in user mode. If all the Flash space
(including the RC calibration value locations) has
been erased (after the read-out protection remov-
al), then the RC calibration values can still be ob-
tained through these two address.
Notes:
– In ICC mode, the internal RC oscillator is forced
as a clock source, regardless of the selection in
the option byte. Refer to note 5 in section 4.4 on
page 12 for further details.
page 67. for more information on the frequency
and accuracy of the RC oscillator.
– To improve clock stability and frequency accura-
cy, it is recommended to place a decoupling ca-
pacitor, typically 100nF, between the VDD and
VSS pins as close as possible to the ST7 device.
Caution: If the voltage or temperature conditions
change in the application, the frequency may need
to be recalibrated.
Refer to application note AN2326 for information
on how to calibrate the RC frequency using an ex-
ternal reference signal.
The ST7ULTRALITE also contains an Auto Wake
Up RC oscillator. This RC oscillator should be en-
abled to enter Auto Wake-up from Halt mode.
The Auto Wake Up RC oscillator can also be con-
figured as the startup clock through the CK-
SEL[1:0] option bits (see section 14.1 on page 95).
This is recommended for applications where very
low power consumption is required.
Switching from one startup clock to another can be
done in run mode as follows (see Figure 9):
Case 1: Switching from internal RC to AWU:
– 1. Set the RC/AWU bit in the CKCNTCSR regis-
ter to enable the AWU RC oscillator
– 2. The RC_FLAG is cleared and the clock output
is at 1.
– 3. Wait 3 AWU RC cycles till the AWU_FLAG is
set
– 4. The switch to the AWU clock is made at the
positive edge of the AWU clock signal
– 5. Once the switch is made, the internal RC is
stopped
Case 2: Switching from AWU RC to internal RC:
– 1. Reset the RC/AWU bit to enable the internal
RC oscillator
RCCR
Conditions
ST7LITEUS2/
ST7LITEUS5
Address
RCCRH0
VDD=5V
TA=25°C
fRC=8MHz
DEE0h 1) (CR[9:2] bits)
RCCRL0
DEE1h 1) (CR[1:0] bits)
RCCRH1
VDD=3.3V
TA=25°C
fRC=8MHz
DEE2h 1) (CR[9:2] bits)
RCCRL1
DEE3h 1) (CR[1:0] bits)
1
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