Texas Instruments TMS320C3x - Manual (Page 59)

Peripherals
2-23 Architectural Overview
2.9.1 Timers
The two timer modules are general-purpose 32-bit timer/event counters with
two signaling modes and internal or external clocking. They can signal internally
to the ’C3x or externally to the outside world at specified intervals or they can
count external events. Each timer has an I/O pin that can be used as an input
clock to the timer, as an output signal driven by the timer, or as a general-purpose
I/O pin. See Chapter 12,
Peripherals, for more information about timers.
2.9.2 Serial Ports
The bidirectional serial ports (two on ’C30, one each on the ’C31 and ’C32) are
totally independent. They are identical to a complementary set of control registers
that control each port. Each serial port can be configured to transfer 8, 16, 24,
or 32 bits of data per word. The clock for each serial port can originate either
internally or externally. An internally generated divide-down clock is provided.
The pins are configurable as general-purpose I/O pins. The serial ports can also
be configured as timers. A special handshake mode allows ’C3x devices to
communicate over their serial ports with guaranteed synchronization.