IEEE 1149.1 Test Access Port (JTAG)
32-5
Freescale Semiconductor
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
32.3.3
Bypass Register
The bypass register is a single-bit shift register path from TDI to TDO when the BYPASS instruction is
selected.
32.3.4
JTAG_CFM_CLKDIV Register
The JTAG_CFM_CLKDIV register is a 7-bit clock divider for the CFM that is used with the
LOCKOUT_RECOVERY instruction. It controls the period of the clock used for timed events in the CFM
erase algorithm. The JTAG_CFM_CLKDIV register must be loaded before the lockout sequence can
begin.
32.3.5
TEST_CTRL Register
The TEST_CTRL register is a 3-bit shift register path from TDI to TDO when the
ENABLE_TEST_CTRL instruction is selected. The TEST_CTRL transfers its value to a parallel hold
register on the rising edge of TCLK when the TAP state machine is in the update-DR state.
32.3.6
Boundary Scan Register
The boundary scan register is connected between TDI and TDO when the EXTEST or
SAMPLE/PRELOAD instruction is selected. It captures input pin data, forces fixed values on output pins,
and selects a logic value and direction for bidirectional pins or high impedance for tri-stated pins.
The boundary scan register contains bits for bonded-out and non bonded-out signals, excluding JTAG
signals, analog signals, power supplies, compliance enable pins, and clock signals.
Table 32-4. IDCODE Field Descriptions
Field
Description
31–28
PRN
Part revision number. Indicate the revision number of the device.
27–22
DC
Freescale design center number.
21–12
PIN
Part identification number. Indicate the device number.
0x048 MCF52230
0x049 MCF52231
0x04A MCF52233
0x04B MCF52234
0x04C MCF52235
0x04D MCF52236
11–1
JEDEC
Joint Electron Device Engineering Council ID bits. Indicate the reduced JEDEC ID for Freescale (0x0E).
0
ID
IDCODE register ID. This bit is set to 1 to identify the register as the IDCODE register and not the bypass register
according to the IEEE standard 1149.1.
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
