PXD20RM Datasheet, PDF (887/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

IR[4:0]: 0_0001 (IDCODE)
Access: R/O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
PRN
DC
PIN
MIC
ID
W
Reset _{0 0 0 0 1 0 1 0 1 1 1 0 0 1 1 0 0 1 0 1 0 0 0 0 0 0 0 1 1 1 0 1}
Figure 24-3. Device Identification Register
Table 24-2. Device Identification Register Field Descriptions
Field
Description
0–3 Part revision number. Contains the revision number of the device. This field changes with each revision
PRN of the device or module.
4–9 Design center.
DC
10–19 Part identification number. Contains the part number of the device.
PIN
20–30 Manufacturer identity code. Contains the reduced Joint Electron Device Engineering Council (JEDEC) ID
MIC for Freescale, 0xE
31 IDCODE register ID. Identifies this register as the device identification register and not the bypass
ID register. Always set to 1.
24.7.4 Boundary Scan Register
The boundary scan register is connected between TDI and TDO when the EXTEST, SAMPLE or
SAMPLE/PRELOAD instructions are active. It is used to capture input pin data, force fixed values on
output pins, and select a logic value and direction for bidirectional pins. Each bit of the boundary scan
register represents a separate boundary scan register cell, as described in the IEEE 1149.1-2001 standard
and discussed in Section 24.8.5, Boundary Scan. The size of the boundary scan register is 464 bits.
24.8 Functional description
24.8.1 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.
24.8.2 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. For more detail on TAP sharing via JTAGC instructions refer to
Section 24.8.4.2, ACCESS_AUX_TAP_x Instructions.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
24-5