Akai PDP4273M Service Manual page 55

Pad Description
Pad Name I/O Options
Pull-high*
PA0~PA7 I/O
Wake-up
PB0/BZ
Pull-high*
PB1/BZ I/O
I/O or BZ/BZ
PB2
¾ ¾
VSS
PC0/INT
I/O Pull-high*
PC1/TMR
¾
RES I
¾ ¾
VDD
OSC1 I Crystal
OSC2 O or RC
* All pull-high resistors are controlled by an option bit.
Absolute Maximum Ratings
Supply Voltage ...........................V
Input Voltage..............................V
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Rev. 1.30
Bidirectional 8-bit input/output port. Each bit can be configured as wake-up
input by options. Software instructions determine the CMOS output or
Schmitt trigger input with a pull-high resistor (determined by pull-high op-
tions).
Bidirectional 3-bit input/output port. Software instructions determine the
CMOS output or Schmitt trigger input with a pull-high resistor (determined by
pull-high options).
The PB0 and PB1 are pin-shared with the BZ and BZ, respectively. Once the
PB0 and PB1 are selected as buzzer driving outputs, the output signals come
from an internal PFD generator (shared with a timer/event counter).
Negative power supply, ground
Bidirectional I/O lines. Software instructions determine the CMOS output or
Schmitt trigger input with a pull-high resistor (determined by pull-high op-
tions). The external interrupt and timer input are pin-shared with the PC0 and
PC1, respectively. The external interrupt input is activated on a high to low
transition.
Schmitt trigger reset input. Active low
Positive power supply
OSC1, OSC2 are connected to an RC network or Crystal (determined by op-
tions) for the internal system clock. In the case of RC operation, OSC2 is the
output terminal for 1/4 system clock.
-0.3V to V
+6.0V
Storage Temperature ............................-50°C to 125°C
SS SS
-0.3V to V
+0.3V
Operating Temperature...........................-40°C to 85°C
SS DD
3
53／72
HT48R06A-1/HT48C06
Description
August 7, 2003