Intel 8XC196MH, 8XC196MD, 8XC196MC manual Minimum Connections, Minimum Required Signals, Reset#

CHAPTER 13 MINIMUM HARDWARE CONSIDERATIONS

The 8XC196MC, MD, and MH have several basic requirements for operation 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 device to function and Figure 13-1 shows the connections for a minimum configuration.

		Table 13-1. Minimum Required Signals
Signal	Type	Description
Name
ANGND	GND	Analog Ground
		ANGND must be connected for A/D converter and port 0 operation (also port 1 on
		the 8XC196MC and MD). ANGND and VSS should be nominally at the same
		potential.
RESET#	I/O	Reset
		A level-sensitive reset input to and open-drain system reset output from the micro-
		controller. Either a falling edge on RESET# or an internal reset turns on a pull-down
		transistor connected to the RESET# pin for 16 state times. In the powerdown and
		idle modes, asserting RESET# causes the chip to reset and return to normal
		operating mode. The 8XC196MH provides the option of preventing an internal reset
		from generating a reset on the external pin (see “Resetting the Device” on page
		13-8). After a device reset, the first instruction fetch is from 2080H.
VCC	PWR	Digital Supply Voltage
		Connect each VCC pin to the digital supply voltage.
VPP	PWR	Programming Voltage
		During programming, the VPP pin is typically at +12.5 V (VPP voltage). Exceeding the
		maximum VPP voltage specification can damage the device.
		VPP also causes the device to exit powerdown 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 not 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 both the analog portion 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 ground through the lowest possible impedance path.

13-1