Signal Descriptions
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
2-13
2.13 General Purpose Timer Signals
describes the general purpose timer signals.
2.14 Pulse Width Modulator Signals
describes the PWM signals.
2.15 Debug Support Signals
The signals in
are used as the interface to the on-chip JTAG controller and also to interface to
the BDM logic.
Table 2-12. GPT Signals
Signal Name
Abbreviation
Function
I/O
General Purpose Timer
Input/Output
GPT[3:0]
Inputs to or outputs from the general purpose timer module
I/O
Table 2-13. PWM Signals
Signal Name
Abbreviation
Function
I/O
PWM Output Channels
PWM[7:0]
Pulse width modulated output for PWM channels
O
Table 2-14. Debug Support Signals
Signal Name
Abbreviation
Function
I/O
JTAG Enable
JTAG_EN
Select between debug module and JTAG signals at reset
I
Test Reset
TRST
This active-low signal is used to initialize the JTAG logic
asynchronously.
I
Test Clock
TCLK
Used to synchronize the JTAG logic.
I
Test Mode Select
TMS
Used to sequence the JTAG state machine. TMS is sampled on the
rising edge of TCLK.
I
Test Data Input
TDI
Serial input for test instructions and data. TDI is sampled on the rising
edge of TCLK.
I
Test Data Output
TDO
Serial output for test instructions and data. TDO is three-stateable and
is actively driven in the shift-IR and shift-DR controller states. TDO
changes on the falling edge of TCLK.
O
Development Serial
Clock
DSCLK
Development Serial Clock. Internally synchronized input. (The logic
level on DSCLK is validated if it has the same value on two
consecutive rising bus clock edges.) Clocks the serial communication
port to the debug module during packet transfers. Maximum frequency
is PSTCLK/5. At the synchronized rising edge of DSCLK, the data
input on DSI is sampled and DSO changes state.
I
Breakpoint
BKPT
Breakpoint. Input used to request a manual breakpoint. Assertion of
BKPT puts the processor into a halted state after the current
instruction completes. Halt status is reflected on processor status
signals (PST[3:0]) as the value 0xF.
I
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
