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NIBP
Module:
NIBP Pneumatic Board - 0670-00-0369 and
Control Board - 0670-00-0375
OVERVIEW
The NIBP module consists of two boards interconnected by a 20 pin cable: the control
board that contains most of the electronic circuitry ; and a pneumatic board that con-
tains all the pneumatic parts.
THE CPU
The electronics are built around a 16 bit microcontroller (80C196).
Built into the
80C166, in an 8-channel 10-bit A/D converter, five 8-bit 1/0 ports, pulse width
modulators, high-speed inputs and outputs, an UART, a watchdog timer, and two
16-bit counter/timer
An 11.0592MHz crystal is connected to the on-chip oscillator of the 800196. This fre-
quency is chosen for accurate generation of standard baud rates (the on-chip UART
has an integral baud rate generator). An RC circuit, Ri and C1, resets the 80C196 on
power-up. The microcontroller can also be reset from an external, open-collector, ac-
tive low reset signal from Pin 8 of connecter J28.
The non-maskable interrupt, NMI, of the 800196 is used to detect the overpressure
(OVPR) condition. A low to high transition on the OVPR signal will cause the
microcontroller to sense the overpressure condition. The OVPR signal is also con-
nected to the high speed input bit 1 of the microcontroller for it to verify the overpres-
sure condition. *
The BUSWIDTH input is tied low since the eight bit data bus mode is used for external
memory access. The EA/ pin is tied low since external EPROM and static RAM are
used for program and data memory.
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