Timer Load Register J (Tlj); Timer Load Register K (Tlk) - Hitachi H8S/2199 Hardware Manual

Single-chip microcomputer

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Timer Load Register J (TLJ)

Initial value :

The timer load register J (TLJ) is an 8-bit write only register which works to set the reloading

value of the TCJ.

When the reloading value is set to the TLJ, the value will be simultaneously loaded to the TCJ and

the TCJ starts counting down from the set value. Also, during an auto reloading operation, when

the TCJ underflows, the value of the TLJ will be loaded to the TCJ. Consequently, the

underflowing cycle can be set within the range of 1 to 256 input clocks. Nonetheless, when the

EXN bit in TMJC and the 8/16 bit in TMJ are both set to 1, (means when setting is made to 16-bit

operation), writing is possible under the word command only.

At this time, the upper 8 bits can be written into the TLK of the TMJ-2 and the lower 8 bits can be

written into the TLJ. When the EXN bit in TMJC is 0, TLJ can be written to only in byte units; an

8-bit reload value is written to TLJ.

The TLJ and TCJ are being allocated to the same address.

When reset, the TLJ is initialized to H'FF.

Initial value :

The timer load register K (TLK) is an 8-bit or a 16-bit write only register which works to set the

reloading value of the TCK.

When the reloading value is set to the TLK, the value will be simultaneously loaded to the TCK

and the TCK starts counting down from the set value. Also, during an auto reloading operation,

when the TCK underflows, the value of the TLK will be loaded to the TCK. Consequently, the

underflowing cycle can be set within the range of 1 to 256 input clocks. Nonetheless, when the

EXN bit in TMJC and the 8/16 bit in TMJ are both set to 1, (means when setting is made to 16-bit

operation), writing is possible under the word command only. At this time, the upper 8 bits can be

written into the TLK and the lower 8 bits can be written into the TLJ of the TMJ-1. When the

EXN bit in TMJC is 0, TLK can be written to only in word units; a 16-bit reload value is written

to TLK. The TLK and TCK are being allocated to the same address.

When reset, the TLK is initialized to H'FF.

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