Fujitsu FR81S User Manual
CHAPTER 48: WAVEFORM GENERATOR
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WAVEFORM GENERATOR
FUJITSU SEMICONDUCTOR CONFIDENTIAL
46
Operation of the DTTI pin control
You will be able to control the RTO0 to RTO5 outputs by DTTI pins when you set the DTIE of the waveform
control register 1 (SIGCR1) to "1". If "L" level of the DTTI pin is detected, RTO0 to RTO5 function as
general-purpose ports until the interrupt flag (DTIF of SIGCR1 register) is cleared.
The state of general-purpose ports RT00 to RT05 during the detection of interrupt flag (DTIF) is independent
of the setting of the extended port function registers (EPFR).
See "CHAPTER: I/O PORTS" for the controlling method of general-purpose ports.
Even if "L" level of the DTTI pin input is detected, the timer continues its operation while the waveform
generator is active. No waveform will be output to the external pins RTO0 to RTO5.
Figure 5-16 Operation of the Valid DTTI Input
DTTI Operation of the Waveform Control Register 2 (SIGCR2)
DTTI output of the waveform control register 2 is designed to compute OR with the DTTI pin input and
generate DTTI input. Therefore, if you set this register to "0", the operation is always in the DTTI input state
and any inputs to the DTTI pin will be ignored.
When you clear this register by writing "1" to this register, the value of the DTTI input pin will be used.
MB91520 Series
MN705-00010-1v0-E
2091