MMC2107 Datasheet, PDF (582/618 Pages) –

Freescale Semiconductor, Inc.
JTAG Test Access Port and OnCE
21.14.16 OnCE Commands
The OnCE commands can be classified as:
• Read commands (the device delivers the required data)
• Write commands (the device receives data and writes the data in
one of the OnCE registers)
• Commands with no associated data transfers
21.14.17 Target Site Debug System Requirements
A typical debug environment consists of a target system in which the
MCU resides in the user-defined hardware.
The external command controller acts as the medium between the MCU
target system and a host computer. The external command controller
circuit acts as a serial debug port driver and host computer command
interpreter. The controller issues commands based on the host
computer inputs from a user interface program which communicates
with the user.
21.14.18 Interface Connector for JTAG/OnCE Serial Port
Figure 21-16 shows the recommended connector pinout and interface
requirements for debug controllers that access the JTAG/OnCE port.
The connector has two rows of seven pins with 0.1-inch center-to-center
spacing between pins in each row and each column.
Technical Data
582
JTAG Test Access Port and OnCE
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MMC2107 – Rev. 2.0
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