Typewriter User Manual

3- 48 MC68340 USER’S MANUAL MOTOROLA
CLKOUT
VCO
LOCK
BUS
CYCLES
RESET
V
CC
1
23 4
BUS STATE
UNKNOWN
ADDRESS AND
CONTROL SIGNALS
THREE-STATED
512
TCLKOUT
14 CLOCKS
≤
NOTES:
1. Internal start-up time.
2. SSP read here.
3. PC read here.
4. First instruction fetched here.
328
TCLKIN

××
Figure 3-28. Power-Up Reset Timing Diagram
When a RESET instruction is executed, the MC68340 drives the RESET signal for 512
clock cycles. The SIM40 registers and the module control registers in each internal
peripheral module (DMA, timers, and serial modules) are not affected. All other peripheral
module registers are reset the same as for a hardware reset. The external devices
connected to the
RESET signal are reset at the completion of the RESET instruction.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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