Renesas Hitachi H8S/2191, Hardware Manual

Page: 341 / 1065

Rev. 2.0, 11/00, page 314 of 1037
14.2.6 Timer Load Register J (TLJ)
0
1
1
1
W
2
1
W
3
1
4
1
W
5
1
6
1
7
W W W
TLR15
W
TLR16
1
W
TLR17 TLR14 TLR13 TLR12 TLR11 TLR10
Bit :
Initial value :
R/W :
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
8/16 bit of the TMJ is being 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.
The TLJ and TCJ are being allocated to the same address.
When reset, the TLJ is initialized to H'FF.
14.2.7 Timer Load Register K (TLK)
0
1
1
1
W
2
1
W
3
1
4
1
W
5
1
6
1
7
W W W
TLR25
W
TLR26
1
W
TLR27 TLR24 TLR23 TLR22 TLR21 TLR20
Bit :
Initial value :
R/W :
The timer load register K (TLK) is an 8-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
8/16 bit of the TMJ is being 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. The TLK and TCK are
being allocated to the same address.
When reset, the TLK is initialized to H'FF.