Block Diagram
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3-17
3
modified within the Z85230 according to the interrupt source. Interrupt
request levels are programmed via the PBC. All modem control lines from
the ESCC are multiplexed/de-multiplexed through J3 by the P2MX
function due to I/O pin limitations. Refer to the Z85230 data sheet and to
the MCP750 Single Board Computer Programmer's Reference Guide for
additional information.
Z8536 CIO Device
The Z8536 CIO device complements the Z85230 ESCC by supplying
modem control lines not provided by the Z85230 ESCC. In addition, the
Z8536 CIO device has three independent 16-bit counters/ timers. The
Z85230 receives a 5 MHz clock input.
MCP750HA Board Identifier
The MCP750HA CPU board is uniquely identified by the following
registers:
❏
The CPU Configuration Register is an 8-bit register located at
ISA I/O address x0800. The CPUType field will return Eh for the
MCP750HA.
Table 3-3. Old CPU Configuration Register
REG
Old CPU Configuration Register - $FE000800
BIT
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
FIELD
CPUTYPE
OPER
R
R
RESET
$E
$F
Summary of Contents for MCP750HA Series
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