Datasheet

V850ES/JG3 CHAPTER 12 REAL-TIME OUTPUT FUNCTION (RTO)
R01UH0015EJ0300 Rev.3.00 Page 405 of 870
Sep 30, 2010
12.5 Usage
(1) Disable real-time output.
Clear the RTPC0.RTPOE0 bit to 0.
(2) Perform initialization as follows.
• Set the alternate-function pins of port 5
Set the PFC5.PFC5m bit and PFCE5.PFCE5m bit to 1, and then set the PMC5.PMC5m bit to 1 (m = 0 to 5).
• Specify the real-time output port mode or port mode in 1-bit units.
Set the RTPM0 register.
• Channel configuration: Select the trigger and valid edge.
Set the RTPC0.EXTR0, RTPC0.BYTE0, and RTPC0.RTPEG0 bits.
• Set the initial values to the RTBH0 and RTBL0 registers
Note 1
.
(3) Enable real-time output.
Set the RTPOE0 bit = 1.
(4) Set the next output value to the RTBH0 and RTBL0 registers by the time the selected transfer trigger is
generated
Note 2
.
(5) Set the next real-time output value to the RTBH0 and RTBL0 registers via interrupt servicing corresponding to the
selected trigger.
Notes 1. If the RTBH0 and RTBL0 registers are written when the RTPOE0 bit = 0, that value is transferred to
real-time output latches 0H and 0L, respectively.
2. Even if the RTBH0 and RTBL0 registers are written when the RTPOE0 bit = 1, data is not transferred to
real-time output latches 0H and 0L.
12.6 Cautions
(1) Prevent the following conflicts by software.
• Conflict between real-time output disable/enable switching (RTPOE0 bit) and selected real-time output trigger.
• Conflict between writing to the RTBH0 and RTBL0 registers in the real-time output enabled status and the
selected real-time output trigger.
(2) Before performing initialization, disable real-time output (RTPOE0 bit = 0).
(3) Once real-time output has been disabled (RTPOE0 bit = 0), be sure to initialize the RTBH0 and RTBL0 registers
before enabling real-time output again (RTPOE0 bit = 0 → 1).