NEC V850/SB1TM User Manual page 369

CHAPTER 13
13.1 Function
The real-time output function transfers preset data to real-time output buffer registers (RTBL, RTBH), and then
transfers this data with hardware to an external device via the output latches, upon the occurrence of an external
interrupt or external trigger. The pins through which the data is output to an external device constitute a port called a
real-time output port.
Because RTO can output signals without jitter, it is suitable for controlling a stepping motor.
The real-time output port can be set in port mode or real-time output port mode in 1-bit units.
The block diagram of RTO is shown below.
RTPOE RTPEG
RTPTRG
Output trigger
INTTM4
INTTM5
REAL-TIME OUTPUT FUNCTION (RTO)
Figure 13-1. Block Diagram of RTO
Real-time output port
control register (RTPC)
BYTE EXTR
4
Real-time output
buffer register, higher
controller
4 bits (RTBH)
User's Manual U13850EJ4V0UM
Internal bus
Real-time output
buffer register, lower
4 bits (RTBL)
Output latch
Real-time output
port mode
register (RTPM)
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