
IEEE 1149.1 Test Access Port (JTAG)
Freescale Semiconductor
37-3
When one module is selected, the inputs into the other module are disabled or forced to a known logic
level, as shown in
, to disable the corresponding module.
NOTE
The JTAG_EN does not support dynamic switching between JTAG and
BDM modes.
37.2.2
Test Clock Input (TCLK)
The TCLK pin is a dedicated JTAG clock input to synchronize the test logic. Pulses on TCLK shift data
and instructions into the TDI pin on the rising edge and out of the TDO pin on the falling edge. TCLK is
independent of the processor clock. The TCLK pin has an internal pull-up resistor, and holding TCLK high
or low for an indefinite period does not cause JTAG test logic to lose state information.
37.2.3
Test Mode Select/Breakpoint (TMS/BKPT)
The TMS pin is the test mode select input that sequences the TAP state machine. TMS is sampled on the
rising edge of TCLK. The TMS pin has an internal pull-up resistor.
The BKPT pin is used to request an external breakpoint. Assertion of BKPT puts the processor into a halted
state after the current instruction completes.
37.2.4
Test Data Input/Development Serial Input (TDI/DSI)
The TDI pin receives serial test and data, which is sampled on the rising edge of TCLK. Register values
are shifted in least significant bit (lsb) first. The TDI pin has an internal pull-up resistor.
The DSI pin provides data input for the debug module serial communication port.
Table 37-2. Pin Function Selected
JTAG_EN = 0
JTAG_EN = 1
Pin Name
Module selected
BDM
JTAG
—
Pin Function
—
BKPT
DSI
DSO
DSCLK
TCLK
TMS
TDI
TDO
TRST
TCLK
BKPT
DSI
DSO
DSCLK
Table 37-3. Signal State to the Disable Module
JTAG_EN = 0
JTAG_EN = 1
Disabling JTAG
TRST = 0
TMS = 1
—
Disabling BDM
—
Disable DSCLK
DSI = 0
BKPT = 1
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...