Fujitsu Series 3 Manual

 FUJITSU SEMICONDUCTOR LIMITED 
 Example trimming data acquisition using input capture 
Figure 4-3  shows the time chart of high-speed CR oscillation and the trimming process. 
Figure 4-3 Time chart of high-speed CR oscillation and the trimming process 
CLKHC
CLKHC_div PCLK
TRD
Free run
Input CaptureTIMER2
TIMER1 TIMER3 TIMER4
XtrmminXtrmmax
 
Run the free run timer by setting the main oscillation clock (CLKMC) as the master clock (measurement 
reference clock). Clear the free run timer once before...

 FUJITSU SEMICONDUCTOR LIMITED 
 Frequency trimming procedure example 
The following shows a trimming procedure example of high-speed CR oscillation. 
Figure 4-4 Trimming Procedure Example of High-speed CR Oscillation 
Start 
Set the master clock as the main oscillation 
clock by the SCM_CTL register 
 
 
Unlock the MCR_FTRM register 
Write 0x1ACC_E554 to the MCR_RLR 
Set the division ratio of high-speed CR 
oscillation to be input into input capture by the  
M
CRPSR register
Set the input into input...

 FUJITSU SEMICONDUCTOR LIMITED 
 Xtrm calculation procedure example 
The following shows an Xtrm calculation procedure example. Perfor m frequency trimming in the two 
stages of coarse adjustment and fine adjustment. 
Figure 4-5 Xtrm Calculation Procedure Example 
 
Start 
 
Set an Xtrmmin value as the MCR_FTRM 
(value of the initial val ue of the TRD bit - 20%)
Free run timer operation 
Free run timer clear 
Set a trigger for input capture on the rising of the high-speed CR oscillation division clock...

 FUJITSU SEMICONDUCTOR LIMITED 
 Procedure example of using CR trimmi ng area storage data inside flash 
memory 
The following shows a procedure example of readin g trimming data stored in the CR trimming area 
inside flash memory and setting it as the frequency trimming register. 
Figure 4-6 Procedure Example of Using CR Trimming Area Storage Data 
Start 
 
 
Unlock the MCR_FTRM register 
Write 0x1ACC_E554 to the MCR_RLR 
Read the CR trimming area inside flash  memory 
Set the read value as the...

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5.  High-Speed CR Trimming Function Register List 
The following lists and explains registers used for frequency trimming function of the 
high-speed CR oscillator. 
Ta b l e  5 - 1 lists the registers. 
Table 5-1 Register list 
Abbreviation Register name See 
MCR_PSR  High-speed CR oscillation    Frequency Division Setup Register  5.1 
MCR_FTRM High-speed CR oscillation    Frequency Trimming Register  5.2 
MCR_RLR High-speed CR oscillator    Register Write-Protect Register...

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5.1.  High-speed CR oscillation Frequency Division Setup Register (MCR_PSR) 
The MCR_PSR sets the frequency division ratio of high-speed CR oscillation. 
A divided clock can be input into input capture. 
 Register configuration 
bit  7 6 5  4 3 2 1 0 
Field Reserved  CSR 
Initial value - 2b01 
Attribute -  R/W 
 Register functions 
[bit 7:2] : Reserved bits 
0b000000 is read from these bits. 
Set these bits to 0b000000 when writing. 
[bit 1:0] CSR: High-speed CR oscillati...

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5.2.  High-speed CR oscillation Frequency Trimming Register (MCR_FTRM) 
The MCR_FTRM sets the frequency trimming value. 
This section explains register configuration and register functions. 
 Register configuration 
bit  31                16
Field Reserved 
Initial value  - 
Attribute - 
         
bit 15     109 8 7 6 5 4 3 2 1 0 
Field Reserved TRD[9:0] 
Initial value  -  10b0110000000 
Attribute -  R/W 
 Register functions 
[bit 31:10] : Reserved bits 
0 is always read...

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5.3.  High-Speed CR Oscillator Register Write-Protect Register (MCR_RLR) 
The MCR_RLR controls the write-protect state of the frequency trimming register 
(MCR_FTRM). 
 Register configuration 
bit  31         16 
Field TRMLCK[31:16] 
Initial value  16h0000 
Attribute R/W 
         
bit 15       0 
Field TRMLCK[15:0] 
Initial value  16h0001 
Attribute R/W 
 Register functions 
[bit 31:0] TRMLCK: Register write-protect bits 
Bit 31:0  Description 
When read When 0x00000000...

 
6. High-Speed CR Trimming Function Usage Precautions 
 FUJITSU SEMICONDUCTOR LIMITED 
Chapter: High-Speed CR Trimming 
FUJITSU SEMICONDUCTOR CONFIDENTIAL  16 
6.  High-Speed CR Trimming Function Usage Precautions 
This section explains the precautions for using high-speed CR trimming function. 
   About low-speed CR oscillator 
This trimming function is only enabled for the high-speed CR oscillator. 
It cannot apply to the low-speed CR oscillator.   
   About data stored in the CR trimming area 
The...

 
 
 
 FUJITSU SEMICONDUCTOR LIMITED 
MN706-00002-1v0-E 
64 
MB9Axxx/MB9Bxxx  Series