HT48RU80/HT48CU80
Pin Name I/O
Configuration
Option
Description
PA0~PA7 I/O
Pull-high
Wake-up
Schmitt Trigger
Bidirectional 8-bit input/output port. Each pin can be config
-
ured as a wake-up input by configuration option. Software in
-
structions determine if the pin is a CMOS output or input.
Configuration options determine if all pins on this port have
pull-high resistors and if the inputs are Schmitt Trigger or non
Schmitt Trigger.
PB0/BZ
PB1/BZ
PB2/INT1
PB3/TMR2
PB4~PB7
PC0/TX
PC1/RX
PC2~PC7
PD0~PD7
PE0~PE7
PF0~PF7
PG0~PG7
I/O
Pull-high
I/O or BZ/BZ
Bidirectional 8-bit input/output ports. Software instructions
determine if the pin is a CMOS output or Schmitt Trigger in
-
put. A configuration option for each port determines if all pins
on the relevant port have pull-high resistors. Pins PB0, PB1,
PB2 and PB3 are pin-shared with BZ, BZ
, INT1 and TMR2 re
-
spectively. Pins PC0 and PC1 are pin-shared with the UART
pins TX and RX.
INT0 I
¾
External interrupt Schmitt Trigger input. Edge triggered on
high to low transition.
TMR0 I
¾
Schmitt Trigger input for Timer/Event Counter 0
TMR1 I
¾
Schmitt Trigger input for Timer/Event Counter 1
OSC1
OSC2
I
O
Crystal or RC
or Int.
RC+RTC
OSC1, OSC2 are connected to an external RC network or ex-
ternal Crystal (determined by configuration option) for the in-
ternal system clock. For external RC system clock operation,
OSC2 is an output pin for 1/4 system clock.
These two pins also can be optioned as an RTC oscillator
(32768Hz). In this case, the system clock comes from an in-
ternal RC oscillator whose nominal frequency at 5V has 4 op-
tions, 3.2MHz, 1.6MHz, 800kHz, 400kHz.
RES I
¾
Schmitt Trigger reset input. Active low.
VDD
¾¾
Positive power supply
VSS
¾¾
Negative power supply, ground
Note 1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration is
chosen for a particular port, then all input pins on this port will be connected to pull-high
resistors.
3. Pins PE4~PE7 and pins PF4~PF7 only exist on the 64-pin package.
4. Port G only exists on the 64-pin package.
Chapter 1 Hardware Structure
13
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