MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 573

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

22.10 Non-Scan Chain Operation
22.11 Boundary Scan
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
These devices feature a low-power stop mode. The interaction of the
scan chain interface with low-power stop mode is:
Keeping the TAP controller in the test-logic-reset state will ensure that
the scan chain test logic is kept transparent to the system logic. It is
recommended that TMS, TDI, TCLK, and TRST be pulled up. TRST
could be connected to ground. However, since there is a pullup on
TRST, some amount of current will result. JTAG will be initialized to the
test-logic-reset state on power-up without TRST asserted low due to the
JTAG power-on-reset internal input. The low-level TAP module in the
M•CORE also has the power-on-reset input.
The Boundary Scan Register contains 200 bits. This register can be
connected between TDI and TDO when EXTEST or
SAMPLE/PRELOAD instructions are selected. This register is used for
capturing signal pin data on the input pins, forcing fixed values on the
output signal pins, and selecting the direction and drive characteristics
(a logic value or high impedance) of the bidirectional and three-state
signal pins.
1. The TAP controller must be in the test-logic-reset state to either
2. The TCLK input is not blocked in low-power stop mode. To
3. The TMS, TDI, TRST pins include on-chip pullup resistors. In
Freescale Semiconductor, Inc.
For More Information On This Product,
enter or remain in the low-power stop mode. Leaving the
test-logic-reset state negates the ability to achieve low-power, but
does not otherwise affect device functionality.
consume minimal power, the TCLK input should be externally
connected to V
low-power stop mode, these three pins should remain either
unconnected or connected to V
consumption.
JTAG Test Access Port and OnCE
Go to: www.freescale.com
DD
.
DD
to achieve minimal power
JTAG Test Access Port and OnCE
Non-Scan Chain Operation
Advance Information
573