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Signal Description
MOTOROLA M68060 USER’S MANUAL 2-15
2.10.2 MC68060 Processor Clock (CLK)
CLK is the synchronous clock of the MC68060. This signal is used internally to clock or
sequence the internal logic of the MC68060 processor and is qualified with CLKEN to clock
all external bus signals.
Since the MC68060 is designed for static operation, CLK can be gated off to lower power
dissipation (e.g., during low-power stopped states). Refer to Section 7 Bus Operation for
more information on low-power stopped states.
2.10.3 Clock Enable (CLKEN)
This input signal is a qualifier for the MC68060 processor clock (CLK) and is provided to sup-
port lower bus frequency MC68060 designs. The internal MC68060 bus interface controller
will sample, assert, negate, or three-state signals (except for BB and TIP which can three-
Table 2-7. PSTx Encoding
Hex PST4 PST3 PST2 PST1 PST0 Internal Processor Status
$0000000Continue Execution in User Mode
$0100001Complete 1 Instruction in User Mode
$0200010Complete 2 Instructions in User Mode
$0300011 —
$0400100 —
$0500101 —
$0600110 —
$0700111 —
$0801000Emulator Mode Entry Exception Processing
$0901001Complete Not Taken Branch in User Mode
$0A01010Complete Not Taken Branch Plus 1 Instruction in User Mode
$0B01011IED Cycle of Branch to Vector, Emulator Entry Exception
$0C01100 —
$0D01101Complete Taken Branch in User Mode
$0E01110Complete Taken Branch Plus 1 Instruction in User Mode
$0F01111Complete Taken Branch Plus 2 Instructions in User Mode
$1010000Continue Execution in Supervisor Mode
$1110001Complete 1 Instruction in Supervisor Mode
$1210010Complete 2 Instructions in Supervisor Mode
$1310011 —
$1410100 —
$1510101Complete RTE Instruction in Supervisor Mode
$1610110Low-Power Stopped State; Waiting for an Interrupt or Reset
$1710111MC68060 Is Stopped Waiting for an Interrupt
$1811000MC68060 Is Processing an Exception
$1911001Complete Not Taken Branch in Supervisor Mode
$1A11010Complete Not Taken Branch Plus 1 Instruction in Supervisor Mode
$1B11011IED Cycle of Branch to Vector, Exception Processing
$1C11100MC68060 Is Halted
$1D11101Complete Taken Branch in Supervisor Mode
$1E11110Complete Taken Branch Plus 1 Instruction in Supervisor Mode
$1F11111Complete Taken Branch Plus 2 Instructions in Supervisor Mode
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