Z8F1680SH020SG Datasheet, PDF (41/412 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F1680 Series
Product Specification
16
Table 4. Signal Descriptions (Continued)
Signal Mnemonic I/O Description
Oscillators
XIN
XOUT
X2IN
X2OUT
I
External Crystal Input: The input pin to the crystal oscillator. A crystal can be
connected between the pin and the XOUT pin to form the oscillator. In
addition, this pin is used with external RC networks or external clock drivers
to provide the system clock.
O
External Crystal Output: This pin is the output of the crystal oscillator. A
crystal can be connected between it and the XIN pin to form the oscillator.
I
Watch Crystal Input: The input pin to the low-power 32 kHz oscillator. A watch
crystal can be connected between the X2IN and the X2OUT pin to form the
oscillator.
O
Watch Crystal Output: This pin is the output from the low power 32 kHz
oscillator. A watch crystal can be connected between the X2IN and the
X2OUT pin to form the oscillator.
Clock Input
CLKIN
I
Clock Input Signal: This pin can be used to input a TTL-level signal to be
used as the system clock.
LED Drivers
LED
O
Direct LED Drive Capability: All Port C pins have the capability to drive an
LED without any other external components. These pins have programmable
drive strengths set by the GPIO block.
On-Chip Debugger
DBG
I/O
Debug: This signal is the control and data input and output of the On-Chip
Debugger.
Caution: The DBG pin is open-drain and requires an external pull-up resistor
to ensure proper operation.
Reset
RESET
I/O RESET: Generates a Reset when asserted (driven Low). Also serves as a
Reset indicator; the Z8 Encore! XP forces this pin Low when in Reset. This
pin is open-drain and features an enabled internal pull-up resistor.
Power Supply
V_DD
I Digital Power Supply.
AV_DD
I Analog Power Supply.
V_SS
I Digital Ground.
AV_SS
I Analog Ground.
Note: The AV_DD and AV_SS signals are available only in 28-pin, 40-pin and 44-pin packages.
PS025015-1212
PRELIMINARY
Pin Description