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H8SX/1663M Datasheet(PDF) 1239 Page - Renesas Technology Corp |
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H8SX/1663M Datasheet(HTML) 1239 Page - Renesas Technology Corp |
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1239 / 1504 page  Section 26 Boundary Scan Rev. 2.00 Sep. 24, 2008 Page 1207 of 1468 REJ09B0412-0200 26.4 Register Descriptions Boundary scan has the following four registers. These registers cannot be accessed from the CPU. • Introduction register (JTIR) • Bypass register (JTBPR) • Boundary scan register (JTBSR) • IDCODE register (JTIDR) Instructions can be input to the instruction register (JTIR) via the test data input pin (TDI) by serial transfer. The bypass register (JTBPR), which is a 1-bit register, is connected between the TDI and TDO pins in BYPASS mode. The boundary scan register (JTBSR), which is a JTBSR-bit register (see table 26.4), is connected between the TDI and TDO pins when test data are being shifted in. None of the registers is accessible from the CPU. Table 26.2 shows the availability of serial transfer for the registers. Table 26.2 Serial Transfers for Registers Register Abbreviation Serial Input Serial Output JTIR Available Not available JTBPR Available Available JTBSR Available Available JTID Not available Available |
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