Fujitsu Series 3 Manual

 
9. Descriptions of base timer functions 
 
[bit 2] TGIR: Trigger interrupt request bit   When a software trigger or trigger input is detected, the TGIR bit is set to 1. 
   The TGIR bit is cleared by writing 0. 
   Even if 1 is written to the TGIR  bit, the bit value is not affected. 
   The read value of read-modify-write instructions is 1 regardless of the bit value. 
Bit Description 
0  Clears an interrupt cause. 
1 Detects an interrupt cause. 
 
[bit 1] res: Reserved bit  The read value is 0....

 
9. Descriptions of base timer functions 
 
9.3.4. PWM Cycle Set Register (PCSR) 
The PWM Cycle Set Register (PCSR) is a register for storing the initial counter value. In 32-bit 
mode and for the even channel, the initial count value of the lower 16 bits is stored. For the 
odd channel, the initial count value of the upper 16 bits is stored. The initial value after a reset 
is undefined. Be sure to use the 16-bit data transfer instruction to access this register. 
 bit 15       0 
Field PCSR [15:0]...

 
9. Descriptions of base timer functions 
 
9.3.5. Timer  Register  (TMR) 
The Timer Register (TMR) is a register that reads the count value of a timer. In 32-bit mode 
and for the even channel, the count value of the lower 16 bits is read. For the odd channel, the 
count value of the upper 16 bits is read. The initial value is undefined. 
Be sure to use the 16-bit data transfer instruction to read this register. 
 bit 15       0 
Field TMR [15:0] 
Attribute R 
Initial value  0xXXXX 
 
The value of the...

 
9. Descriptions of base timer functions 
 
9.4.  PWC timer function 
The function of the base timer can be set to either the 16-bit PWM timer, 16-bit PPG timer, 
16/32-bit reload timer, or 16/32-bit PWC timer using the FMD2, 1, and 0 bits in the Timer 
Control Register. This section explains the timer functions available when PWC is set. 
1. Operations of the PWC timer 
2.  Timer Control Registers (TMCR and TMCR2) and Status Control Register (STC) used when the PWC 
timer is selected 
3.  Data Buf f...

 
9. Descriptions of base timer functions 
 
9.4.1. Operations of the PWC timer 
The PWC timer has the pulse width measurement function. Five types of count clock are 
available for measuring the time and cycle between any input pulse events. This section 
explains the basic functions and operations of the pulse width measurement function. 
 Pulse width measurement function 
Count operation is not performed until the counter is  started and cleared to 0x0000 and the specified 
measurement start edge is...

 
9. Descriptions of base timer functions 
 
 Selection of count clock 
The count clock of the counter can be selected from eight types by setting bit 8: CKS3 in the TMCR2 
register and bit 14 to 12: CKS2, CKS1, and CKS0 in the TMCR register. 
The selectable count clocks are as follows: 
TMCR2 and TMCR registers 
CKS3, CKS2, CKS1, and CKS0 bits  Internal count clock to be selected 
0b0000 
Machine clock [Initial value] 
0b0001 1/4  frequency of the machine clock 
0b0010  1/16 frequency of the machine...

 
9. Descriptions of base timer functions 
 
 Starting and stopping pulse width measurement 
Set bit 1: CTEN bit in the TMCR to start, restart, or st op forcibly each operation. 
The pulse width measurement is started or restarted  by writing 1 to the CTEN bit, and it is stopped 
forcibly by writing 0 to the CTEN bit. 
CTEN Function 
1  Starts or restarts the pulse width measurement.
0  Forcibly stops the pulse width measurement. 
 Operation after a restart 
After the counter is restarted in pulse...

 
9. Descriptions of base timer functions 
 
 Details on pulse width measurement operations 
  One-shot measurement and continuous measurement 
Pulse width measurement can be performed in two modes: one for performing measurement only one time 
and the other for performing it continuously. Each mode  is selected with the MDSE bit in the TMCR (see   
Selection of operation mode ).Differences between these modes are as follows: 
One -shot m
easurem

ent mode: 
When the first measurement end edge is...

 
9. Descriptions of base timer functions 
 
 Measurement modes and count operations 
The measurement mode can be selected from five types, differing in which part of the input pulse is 
measured. The following are explanations: 
Measurement 
mode  EGS2, 1, and 0 Item to be measured   
(W: Pulse width to be measured) 
HIGH pulse width 
measurement  0b000   
 
 
 
The width of the HIGH period is measured. 
Count (measurement) start: At detection of a rising edge 
Count (measurement) end: At detection of...

 
9. Descriptions of base timer functions 
 
 Pulse width/cycle calculation method 
After completion of measurement, the measured pulse width/cycle can be calcu lated as follows from the 
measurement result data stored in the DTBF: 
T
W = n x t  TW : Measured pulse width/cycle 
 n
 :  Measurement result data stored in the DTBF 
  t  :  Count clock cycle 
 
  Generation of interrupt requests 
Two interrupt requests can be generated. 
  Interrupt request due to a counter overflow 
When count-up causes...