CHAPTER 13 REAL-TIME OUTPUT FUNCTION (RTO)
User’s Manual U13850EJ4V0UM
373
13.4 Operation
If the real-time output operation is enabled by setting the bit 7 (RTPOE) of the real-time output port control register
(RTPC) to 1, the data of the real-time output buffer registers (RTBH and RTBL) is transferred to the output latch in
synchronization with the generation of the selected transmit trigger (set by EXTR and BYTE
Note
). Of the transferred
data, only the data of the bits specified in the real-time output mode by the real-time output port mode register
(RTPM) is output from the bits of RTP0 to RTP7. The bits specified in the port mode by RTPM output 0.
If the real-time output operation is disabled by clearing RTPOE to 0, RTP0 to RTP7 output 0 regardless of the
setting of RTPM.
Note
EXTR: Bit 4 of the real-time output port control register (RTPC)
BYTE: Bit 5 of the real-time output port control register (RTPC)
Figure 13-5. Example of Operation Timing of RTO (When EXTR = 0, BYTE = 0)
INTTM5 (internal)
INTTM4 (internal)
CPU operation
RTBH
RTBL
RT output latch (H)
RT output latch (L)
A
B
A
B
A
B
A
B
D01
D02
D03
D04
D11
D12
D13
D14
D01
D02
D03
D04
D11
D12
D13
D14
A: Software processing by interrupt request input to INTTM5 (RTBH write)
B: Software processing by interrupt request input to INTTM4 (RTBL write)
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