16-Bit Timers - Motorola MVME2700 Series Installation And Use Manual

The interval timers use the OSC clock input as their clock source. The
MVME2700 drives the OSC pin with a 14.31818MHz clock source.

16-Bit Timers

Four 16-bit timers are available on the MVME2700. The PIB controller
supplies one 16-bit timer; the Z8536 CIO device provides the other three.
For information on programming these timers, refer to the data sheets for
the Winbond W83C553 PIB controller and the Zilog Z8536 CIO device.
Serial Communications Interface
The MVME2700 uses a Zilog Z85230 ESCC (Enhanced Serial
Communications Controller) to implement the two serial communications
interfaces, which are routed through P2. The Z85230 supports
synchronous (SDLC/HDLC) and asynchronous protocols. The
MVME2700 hardware supports asynchronous serial baud rates of 110B/s
to 38.4Kb/s.
Each interface supports the CTS, DCD, RTS, and DTR control signals as
well as the TxD and RxD transmit/receive data signals, and TxC/RxC
synchronous clock signals. Since not all modem control lines are available
in the Z85230, a Z8536 CIO is used to provide the missing modem lines.
A PAL device performs decoding of register accesses and pseudo interrupt
acknowledge cycles for the Z85230 and the Z8536 in ISA I/O space. The
PIB controller supplies DMA support for the Z85230.
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Counter 0 is associated with interrupt request line IRQ0. It can be
used for system timing functions, such as a timer interrupt for a
time-of-day function.
Counter 1 generates a refresh request signal for ISA memory. This
timer is not used in the MVME2700.
Counter 2 provides the tone for the speaker output function on the
PIB controller (the
SPEAKER_OUT
external speaker via the remote reset connector).
Block Diagram
signal which can be cabled to an
5
5-15