ZiLOG eZ80 User Manual page 18

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