CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.4.5Timer 0 Data Register (TDR0)

The timer 0 data register (TDR0) is used to set the timer 0 value in the 8-bit mode of the 8/16-bit capture timer/counter or the interval timer value (interval timer function) or counter value (counter function) of the lower 8 bits in 16-bit mode.

Timer 0 Data Register (TDR0)

The values set in this register are compared with those set in the counter. Figure 8.4-6shows the bit structure of timer 0 data register (TDR0).

Figure 8.4-6 Timer 0 Data Register (TDR0)

Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0 Initial value

001DH

 

 

 

 

 

 

 

 

XXXXXXXXB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

: Readable/Writable

 

 

 

 

 

 

X

: Undefined

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-bit mode (timer 0)

The values set in this register are compared with those set in the counter. When the interval timer function is used, an interval timer value is set. When the counter function is used, the count value to be detected is set. When the count operation is allowed (TCR0: TSTR0 = 0 1), the value in TDR0 is set in (loaded to) the comparator data latch and the counter is incremented.

When the values in the comparator data latch match those in the counter as a result of the increment, the values in the TDR0 are reset in the comparator data latch, the counter is cleared, and the count operation is continued.

The comparator data latch is reset when a match is detected, thus, the values written to the TDR0 when the counter is in operation become valid from the next cycle (after match detection).

Note:

The values set in TDR0 when the interval timer is in operation can be calculated from the expression shown below. However, the instruction cycle is affected by the clock mode and gear function.

Values set in TDR0 = interval time/(count clock cycle instruction cycle) - 1

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Fujitsu MB89202, F202RA manual Timer 0 Data Register TDR0, Bit mode timer

F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

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Memory capacity is a vital characteristic of the MB89202, featuring on-chip RAM and ROM configurations. The microcontroller can accommodate different memory variants, providing developers with flexibility in memory allocation based on their application requirements. This adaptability facilitates applications ranging from simple control systems to complex data processing tasks.

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