Revision 1.27 - August 22, 2007
PPC405EZ – PowerPC 405EZ Embedded Processor
Chameleon Timer
Preliminary Data Sheet
The Chameleon Timer’s Timer Service Engine (TSE) controls the local Timer RAM configured as 120 32-bit words
and up to fifteen 24-bit timer channels, each with an Input Capture Register or an Output Compare Register. The
Chameleon Timer interfaces to the OPB.
Features include:
• Pulse Width Modulation (PWM) and space vector PWM functions with non-overlap times
– Programmable “deadband” intervals
– Pulse period measurement
– 48-bit input capture function
– 48-bit output compare function
– IEEE1588 time stamps
– Automatic up, down, and up-then-down counting with modulus
• Autonomous Timer Service Engine (TSE) manages timer channels
– CPU programs “registers” in Timer SRAM (120x32 bits)
• 15 timer channels + 1 timebase channel
• Pulse period measurements
• Configurable for seven 48-bit channels or 15 24-bit channels
• Up to two timebases available simultaneously
– Each time base has four optional sources: three internal (Timebase A, Timebase B, and IEEE1588) and
one external
• Speed/resolution: 166MHz counter, 2-clock (20ns) minimum period
• Latency: 0.49μsec worst case (based on 133MHz system clock)
• External “Fault” pin to automatically disable timer channel outputs
• Low EMC switching noise
• Unused Timer I/O pins available for GPIO use
• 32-bit OPB slave interface
General Purpose I/O (GPIO) Controller
The GPIO controller enables multiplexing of module I/O pins with multiple functions within the chip. That is, a single
package pin can be assigned to multiple I/O functions. Which function the pin is assigned to is determined by
register bit settings controlled by software. This significantly reduces the number of package pins needed to
support multiple I/O groups.
Features include:
• Up to 54 GPIOs available
– GPIOs are multiplexed with alternate functions
– If not in use for dedicated functions, I/Os are available as GPIOs
• Direct control of all functions from registers programmed by means of OPB bus master accesses
• Time multiplexing of controller outputs to module outputs
• Programmable conversion of module outputs to open-drain outputs (enables sharing of active low outputs
externally)
• Time multiplexing of module inputs to controller inputs
AMCC Proprietary
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AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
