User Manual
UM015201-0603
I/O Connector
ZiLOG Development Platforms
eZ80
®
Sales Demonstration Platform
12
PC0 - PC7
Bidirectional
These pins can be used for general-purpose I/O.
They can be individually programmed as input or out-
put and can also be used individually as interrupt
inputs. Each Port C pin, when programmed as output,
can be selected to be an open-drain or open-source
output. Port C is multiplexed with one UART.
PD0 - PD7
Bidirectional
These pins can be used for general-purpose I/O.
They can be individually programmed as input or out-
put and can also be used individually as interrupt
inputs. Each Port D pin, when programmed as output,
can be selected to be an open-drain or open-source
output. Port D is multiplexed with one UART.
TDO
IN
JTAG Data Output pin.
TDI
OUT
JTAG Data Input pin.
ZDA
Bidirectional
ZDI Data I/O. (Shared with TDI pin.)
TRIGOUT
IN
Active High trigger event indicator.
TCK
PU 10K
OUT
JTAG Input. High on reset enables ZDI mode; Low on
reset enables OCI debug.
ZCL
OUT
ZDI Clock Input. High on reset enables ZDI mode;
Low on reset enables OCI debug. (Shared with TCK
pin.)
TMS
PU 10K
OUT
JTAG Test Mode Select Input.
RTC_V
DD
n/a
RTC supply from eZ80
®
module battery.
CLKOUT
IN
20MHz synchronous CPU clock output from product
module.
IICSCL
PU 4k
Bidirectional
I
2
C Bus Clock.
IICSDA
PU 4k
Bidirectional
I
2
C Data Clock.
FlashWE
PU 10K
OUT
When low, enables write operation on boot block of
external Flash memory on the module.
CS3
IN
Chip select for on-board or external devices
DIS_IRDA
PU 10K
OUT
Low disables module on-board IRDA transceiver to
use PD0/PD1 UART pins externally.
RESET
PU 2k
Schmitt Trigger
OUT, Active
Low
Reset Output from module or push-button reset.
Table 3. I/O Connector Pin Identification (Continued)
Function
Pull
Up/Down
Signal
Direction
Description
