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MC68340 Datasheet(PDF) 378 Page - Freescale Semiconductor, Inc |
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MC68340 Datasheet(HTML) 378 Page - Freescale Semiconductor, Inc |
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378 / 441 page  MOTOROLA MC68340 USER’S MANUAL 9- 3 TEST LOGIC RESET RUN-TEST/IDLE SELECT-DR_SCAN CAPTURE-DR SELECT-IR_SCAN CAPTURE-IR SHIFT-DR SHIFT-IR EXIT1-DR EXIT1-IR PAUSE-DR PAUSE-IR EXIT2-DR UPDATE-DR EXIT2-IR UPDATE -IR 1 0 1 1 0 1 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 0 0 0 0 0 Figure 9-2. TAP Controller State Machine 9.3 BOUNDARY SCAN REGISTER The MC68340 IEEE 1149.1 implementation has a 132-bit boundary scan register. This register contains bits for all device signal and clock pins and associated control signals. The XTAL, X2, and XFC pins are associated with analog signals and are not included in the boundary scan register. All MC68340 bidirectional pins, except the open-drain I/O pins ( DONE1, DONE2, HALT, and RESET), have a single register bit for pin data and an associated control bit in the boundary scan register. All open drain I/O pins have two register bits, input and output, for pin data and no associated control bit. To ensure proper operation, the open-drain pins require external pullups. Twenty-three control bits in the boundary scan register define the output enable signal for associated groups of bidirectional and three-state pins. The control bits and their bit positions are listed in Table 9-1. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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