IEEE 1149.1 Test Access Port Controller (JTAGC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
23-6
Freescale Semiconductor
23.4
Functional Description
23.4.1
JTAGC Reset Configuration
While in reset, the TAP controller is forced into the test-logic-reset state, thus disabling the test logic and
allowing normal operation of the on-chip system logic. In addition, the instruction register is loaded with
the IDCODE instruction.
23.4.2
IEEE 1149.1-2001 (JTAG) Test Access Port
The JTAGC uses the IEEE 1149.1-2001 TAP for accessing registers. This port can be shared with other
TAP controllers on the MCU. Ownership of the port is determined by the value of the JCOMP signal and
the currently loaded instruction. For more detail on TAP sharing via JTAGC instructions refer to
Section 23.4.4.2, “ACCESS_AUX_TAP_x Instructions
Data is shifted between TDI and TDO though the selected register starting with the least significant bit, as
illustrated in
. This applies for the instruction register, test data registers, and the bypass
register.
Figure 23-4. Shifting Data Through a Register
23.4.3
TAP Controller State Machine
The TAP controller is a synchronous state machine that interprets the sequence of logical values on the
TMS pin.
shows the machine’s states. The value shown next to each state is the value of the
TMS signal sampled on the rising edge of the TCK signal.
shows, holding TMS at logic 1 while clocking TCK through a sufficient number of rising
edges also causes the state machine to enter the test-logic-reset state.
Selected register
MSB
LSB
TDI
TDO
Summary of Contents for MPC5565
Page 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
Page 34: ...MPC5565 Reference Manual Rev 1 0 Freescale Semiconductor 15...
Page 35: ...MPC5565 Reference Manual Rev 1 0 16 Freescale Semiconductor...
Page 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
Page 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
Page 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...