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: 20/108页
文件大小: 1957K
代理商: ST7PLITEUS5U3TR
ST7LITEUSx
19/108
6.2 REGISTER DESCRIPTION
MAIN CLOCK CONTROL/STATUS REGISTER
(MCCSR)
Read / Write
Reset Value: 0000 0000 (00h)
Bits 7:1 = Reserved, must be kept cleared.
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[9:2] RC Oscillator Frequency Ad-
justment Bits
These bits, as well as CR[1:0] bits in the SICSR
register must be written immediately after reset to
adjust the RC oscillator frequency and to obtain
the required accuracy. The application can store
the correct value for each voltage range in Flash
memory 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.
SYSTEM INTEGRITY (SI) CONTROL/STATUS
REGISTER (SICSR)
Read/Write
Reset Value: 0000 0x00 (0xh)
Bit 7 = Reserved, must be kept cleared.
Bits 6:5 = CR[1:0] RC Oscillator Frequency Ad-
justment bits
These bits, as well as CR[9:2] bits in the RCCR
register must be written immediately after reset to
adjust the RC oscillator frequency and to obtain
the required accuracy. Refer to section 6.1 on
Bits 4:3 = Reserved, must be kept cleared.
Bits 2:0 = System Integrity bits. Refer to Section
70
00
000
SMS
70
CR9
CR8
CR7
CR6
CR5
CR4
CR3
CR2
70
0
CR1 CR0
0
LVDR
F
AVD
F
AVDI
E
1
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