Intel 8XC196MC, 8XC196MD, 8XC196MH CHAPTER 13 MINIMUM HARDWARE CONSIDERATIONS

13-1
CHAPTER 13
MINIMUM HARDWARE CONSIDERATIONS
The 8XC196MC, MD, and MH have several bas ic requirements for opera tion within a system.
This chapter describes options for providing the basic requirements and discusses other hardware
considerations.
13.1 MINIMUM CONNECTIONS
Table 13-1 lists the signals that are required for the devi ce to function and Figure 13-1 shows the
connections for a minimum configuration.
Table 13-1. Minimum Required Signals
Signal
Name Type Description
ANGND GND Analog Ground
ANGND must be connected f or A/D converter and port 0 operation (also port 1 on
the 8XC196MC and MD). ANGND and VSS should be n ominally at the same
potential.
RESET# I/O Reset
A level-sensitive reset input to and open-dra in syste m reset out put from the micro -
controller. Either a falling edge on RES ET# or an internal re set turns on a pull -down
transistor connected to the RESE T# pin for 16 state times. I n the powerdown and
idle modes, asserting RESET# causes the chip to reset and return to normal
operating mode. The 8XC196MH provides th e option of preventin g an internal reset
from generating a reset on the external pin (see “Resetting the Device” on page
13-8). After a device rese t, the first instruction fetch is from 2080H.
VCC PWR Digital Supply Voltage
Connect each VCC pin to the digital supply volta ge.
VPP PWR Programming Voltage
During programmin g, the VPP pin is typically at +12. 5 V (VPP voltage). Exceedin g the
maximum VPP voltage specification can damage the device.
VPP also causes the device to exit power down mode when it is driven low for at least
50 ns. Use this method to exit powerdown only when using an external clock source
because it enables the internal phase clocks, but no t the internal oscillator.
On devices with no internal nonvolatile memory, connect VPP to VCC.
VREF PWR Reference Voltage for the A/D Converter
This pin also supplies operating voltage to bo th the analo g po rtio n of the A/ D
converter and the logic used to read port 0 (also port 1 in the 8XC196MC and
8XC196MD).
VSS GND Digital Circuit Ground
Connect each VSS pin to g round through the l owest possible impedance path.