Idcode Register Field Descriptions - Motorola ColdFire MCF5281 User Manual

Memory Map/Register Definition
Table 31-4. IDCODE Register Field Descriptions
Bits Name
31–28 PRN Part revision number. Indicate the revision number of the project.
27–22 DC Design center.
21–12 PIN Part identification number. Indicate the device number.
11–1 JEDEC Joint electron device engineering council ID bits. Indicate the reduced JEDEC ID for Motorola.
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.
31.4.2.3 Bypass Register
The bypass register is a single-bit shift register path from TDI to TDO when the BYPASS
instruction is selected.
31.4.2.4 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.
31.4.2.5 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.
31.4.2.6 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.
31-6
Description
MCF5282 User's Manual MOTOROLA