MC68LC040RC25A Datasheet, PDF (105/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
Table 5-1. Signal Index (Continued)
Signal Name
Processor Clock
Mnemonic
PCLK ⁴
Function
Clock input used for internal logic timing. The PCLK frequency is exactly 2 ×
the BCLK frequency.
Test Clock
TCK
Clock signal for the IEEE P1149.1 Test Access Port (TAP).
Test Mode Select
TMS
Selects the principle operations of the test-support circuitry.
Test Data Input
TDI
Serial data input for the TAP.
Test Data Output
Test Reset
TDO
TRST⁴
Serial data output for the TAP.
Provides an asynchronous reset of the TAP controller.
Power Supply
Ground
VCC
GND
Power supply.
Ground connection.
NOTES:
1. This signal is only available on the MC68040.
2. This signal is not available on the MC68EC040 and the MC68EC040V.
3. These signals are different on power-up for the MC68LC040 and MC68EC040.
4. These signals are not available on the MC68040V and MC68EC040V.
MOTOROLA
M68040 USER’S MANUAL
5-3
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