Remote Controlled Data Transmission - Renesas Hitachi H8S/2194 Series Hardware Manual

Regarding the remote controlled data transmission, see section 14.3.3, Remote Controlled Data
Transmission.
14.3.3

Remote Controlled Data Transmission

The Timer J is capable of making remote controlled data transmission. The carrier frequencies
for the remote controlled data transmission can be generated by the TMJ-1 and the burst width
duration and the space width duration can be setup by the TMJ-2.
The data having been written into the reloading register TMJ-1 and into the burst/space duration
register (TLK) of the TMJ-2 will be loaded to the counter at the same time as the remote
controlled data transmission starts. (Remote controlled data transmission starting bit (ST) ← 1)
While remote controlled data transmission is being made, the contents of the burst/space
duration register will be loaded to the counter only while reloading is being made by underflow
signals. Even when a writing is made to the burst/space duration register while remote
controlled data transmission is being made, reloading operation will not be made until an
underflow signal is issued. The TMJ-2 issues TMJ2I interrupt requests by the underflow signals.
The TMJ-1 performs normal reloading operation (including the TMJ1I interrupt requests).
Figure 14.2 shows the output waveform for the remote controlled data transmission function.
When a shift to the low power consumption mode is effected while remote controlled data
transmission is being made, the ST bit will be cleared to 0. When resuming the remote
controlled data transmission after returning to the active mode, write 1.
Remote controlled data
transmission outputs
Setting the remote
controlled mode
Setting the burst width
Figure 14.2 Remote Controlled Data Transmission Output Waveform
Burst width
TMJ-2 toggle output
Setting the
space width
ST bit 1
TMJ-1 can generate
the carrier frequencies
Space width
TMJ-2 toggle output
= 1
Underflow
Rev. 2.0, 11/00, page 317 of 1037
Burst width
TMJ-2 toggle
= 0
output = 1
Setting the
Setting the
space width
burst width
Underflow Underflow