Datascope Accutorr Plus Service Manual page 73

Multiple power and ground pins are used on the microcontoller. All VCC pins get a
bypass capacitor to keep the local power supply quiet.
The following is a signal description for the MC68302 as it is being used in the
Accutorr Plus:
FUNCTIONAL GROUP SIGNALS
Clocks EXTAL
System Control RESET*
HALT*
BERR*
BUSW
DISCPU
Address Bus A23-A1
Data Bus D15-D0
Bus Control AS*
R/W*
UDS*, LDS*
DTACK*
IRQ1*, IRQ6*,
Interrupt Control
IRQ7*
IRQ7*
IRQ6*
IRQ1*
CS0* - CS3*
Chip Select
Serial Communications SPRXD
Port
SPTXD
SPCLK
Channel 1 UART RXD1
TXD1
CTSI*
RTS1*
Channel 2 RXD2/PA0
UART/Port A
TXD2/PA1
PA2
PA3
PA4
PA5
PA6
PA7
RXD3/PA8
TXD3/PA9
PA10
PA11
PA12
Accutorr Plus Service Manual
Chapter 2 - Theory of Operation
SIGNAL DESCRIPTION I/O
Oscillator input I
Microcontroller Reset I/O
Microcontroller Halt I/O
Bus Error I/O
Bus Width Select I
Disable CPU I
Bi-directional addr bus I/O
Bi-directional data bus I/O
Address Strobe I/O
Read/Write I/O
Upper/Lower Data strobe I/O
Data Transfer Acknowledge I/O
Dedicated interrupts, I
edge-sensitive
PWR_OFF* (Power fail- I
ure)
DONE* (DMA done) I
OVPR* (NIBP overpressure) I
Chip Select lines O
SER_DO (NIBP A/D data I
out)
SER_DI (NIBP A/D data in) O
SPCLK (NIBP A/D clock) O
EXT_RD (Receive data) I
EXT_TD (Transmit data) O
EXT_CTS* (Clear to Send) I
EXT_RTS* (Request to O
Send)
SPO2_TXD (SPO2 xmit) I
SPO2_RXD (SPO2 rec'd) O
NEO (NIBP Neonate select) O
PED (NIBP Pediatric select) O
SGAIN (NIBP O
Pressure Gain)
BFAST (NIBP Bleed fast) O
LVEN (NIBP Linear Valve O
enable)
DUMP (NIBP Dump O
valve)
TEMP_TXD (TEMP I
receive data)
TEMP_RXD (TEMP O
transmit data)
GAIN0 (NIBP Pulse Gain) O
GAIN1 (NIBP Pulse Gain) O
CLEAR* (Reset NIBP pulse) O
ACTIVE
high
low
low
low
h-16 bit
high
low
h-read
l-write
low
low
low
low
low
low
low
high
high
high
high
high
high
high
high
high
low
Revised 12/20/00
2-11