EZ80F91MCU Datasheet, PDF (35/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
16
Table 2. Pin Identification on the eZ80F91 Device (Continued)
LQFP BGA
Pin # Pin#
Symbol
Function
Signal Direction
Description
63 J7
RTC_V_DD
Real-Time
Clock Power
Supply
Power supply for the Real-Time
Clock and associated 32KHz
oscillator. Isolated from the power
supply to the remainder of the
chip. A battery can be connected
to this pin to supply constant
power to the Real-Time Clock
and 32KHz oscillator.
64 K8
65 M9
V_SS
Ground
HALT_SLP HALT and
SLEEP
Indicator
Output, Active Low
Ground.
A Low on this pin indicates that
the CPU has entered either HALT
or SLEEP mode because of
execution of either a HALT or
SLP instruction.
66 H7
TMS
JTAG Test Input
Mode Select
JTAG Mode Select Input.
67 L9
TCK
JTAG Test
Clock
Input
JTAG and ZDI clock input.
68 J8
TRIGOUT JTAG Test Output
Trigger Output
Active High trigger event
indicator.
69 K9
TDI
JTAG Test
Data In
Bidirectional
JTAG data input pin. Functions
as ZDI data I/O pin when JTAG is
disabled.
70 M10 TDO
JTAG Test
Data Out
Output
JTAG data output pin.
71 L10 TRST
JTAG Reset Schmitt-trigger input, JTAG reset input pin.
Active Low
72
M11 V_SS
Ground
Note: *PHY represents the physical layer of the OSI model.
Ground.
PS019209-0504
PRELIMINARY
Architectural Overview