Datasheet

XC167CI-16F
Derivatives
General Device Information
Data Sheet 19 V1.3, 2006-08
XTAL2
XTAL1
137
138
O
I
XTAL2: Output of the main oscillator amplifier circuit
XTAL1: Input to the main oscillator amplifier and input to
the internal clock generator
To clock the device from an external source, drive XTAL1,
while leaving XTAL2 unconnected. Minimum and maximum
high/low and rise/fall times specified in the AC
Characteristics must be observed.
Note: Input pin XTAL1 belongs to the core voltage domain.
Therefore, input voltages must be within the range
defined for
V
DDI
.
XTAL3
XTAL4
140
141
I
O
XTAL3: Input to the auxiliary (32-kHz) oscillator amplifier
XTAL4: Output of the auxiliary (32-kHz) oscillator
amplifier circuit
To clock the device from an external source, drive XTAL3,
while leaving XTAL4 unconnected. Minimum and maximum
high/low and rise/fall times specified in the AC
Characteristics must be observed.
Note: Input pin XTAL3 belongs to the core voltage domain.
Therefore, input voltages must be within the range
defined for
V
DDI
.
RSTIN
142 I Reset Input with Schmitt-Trigger characteristics. A low-level
at this pin while the oscillator is running resets the XC167.
A spike filter suppresses input pulses < 10 ns. Input pulses
> 100 ns safely pass the filter. The minimum duration for a
safe recognition should be 100 ns + 2 CPU clock cycles.
Note: The reset duration must be sufficient to let the
hardware configuration signals settle.
External circuitry must guarantee low-level at the
RSTIN
pin at least until both power supply voltages
have reached the operating range.
BRK
OUT
143 O Debug System: Break Out
BRKIN
144 I Debug System: Break In
NC 1, 2,
107 -
110
– No connection.
It is recommended not to connect these pins to the PCB.
Table 2 Pin Definitions and Functions (cont’d)
Sym-
bol
Pin
Num.
Input
Outp.
Function