CHAPTER 12 REAL-TIME OUTPUT FUNCTION (RTO)User’s Manual U16896EJ2V0UD35812.2 ConfigurationRTO consists of the following hardware.Table 12-1. Configuration of RTOItem ConfigurationRegisters Real-time output buffer register 0 (RTBL0, RTBH0)Control registers Real-time output port mode register 0 (RTPM0)Real-time output port control register 0 (RTPC0)(1) Real-time output buffer register 0 (RTBL0, RTBH0)RTBL0 and RTBH0 are 4-bit registers that hold output data in advance.These registers are mapped to independent addresses in the peripheral I/O register area.They can be read or written in 8-bit or 1-bit units.If an operation mode of 4 bits × 1 channel or 2 bits × 1 channel is specified (RTPC0.BYTE0 bit = 0), data canbe individually set to the RTBL0 and RTBH0 registers. The data of both these registers can be read at onceby specifying the address of either of these registers.If an operation mode of 6 bits × 1 channel is specified (BYTE0 bit = 1), 8-bit data can be set to both the RTBL0and RTBH0 registers by writing the data to either of these registers. Moreover, the data of both theseregisters can be read at once by specifying the address of either of these registers.Table 12-2 shows the operation when the RTBL0 and RTBH0 registers are manipulated.0RTBL0RTBH0 0 RTBH05 RTBH04RTBL03 RTBL02 RTBL01 RTBL00After reset: 00H R/W Address: RTBL0 FFFFF6E0H, RTBH0 FFFFF6E2HCautions 1. When writing to bits 6 and 7 of the RTBH0 register, always write 0.2. Accessing the RTBL0 and RTBH0 registers is prohibited in thefollowing statuses. For details, refer to 3.4.8 (1) (b) Access tospecial on-chip peripheral I/O register.• When the CPU operates on the subclock and the main clock oscillation isstopped• When the CPU operates on the internal oscillation clockTable 12-2. Operation During Manipulation of RTBL0 and RTBH0 RegistersRead WriteNoteOperation Mode Register to BeManipulated Higher 4 Bits Lower 4 Bits Higher 4 Bits Lower 4 BitsRTBL0 RTBH0 RTBL0 Invalid RTBL04 bits × 1 channel, 2 bits ×1 channel RTBH0 RTBH0 RTBL0 RTBH0 InvalidRTBL0 RTBH0 RTBL0 RTBH0 RTBL06 bits × 1 channelRTBH0 RTBH0 RTBL0 RTBH0 RTBL0Note After setting the real-time output port, set output data to the RTBL0 and RTBH0 registers by the time a real-time output trigger is generated.
