LCD Type MCU
Pad Name
RES
VDD
VSS
I/O
I
¾
¾
Options
¾
¾
¾
Description
Schmitt Trigger reset input, active low.
Positive power supply
Negative power supply, ground
Note
1. Each pin on PA can be programmed through a configuration option to have a wake-up function.
2. Only pins PA0~PA3 have a pull-high configuration option. This pull-high option can only be
selected if these four pins are configured as NMOS types. If the pull-high option is selected
then it will apply to all of the PA0~PA3 pins, individual pins cannot be selected to have pull-high
resistors. If setup as CMOS outputs the pull-high configuration option is disabled.
HT49R50A-1/HT49C50-1/HT49C50L
Pin Name
I/O
Options
Description
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4~PA7
Bidirectional 8-bit input/output port. Each pin on this
port can be configured as a wake-up input by a con-
figuration option. Configuration options determine
whether pins PA0~PA3 are configured as CMOS out-
Wake-up
puts or NMOS input/output pins. If PA0~PA3 are con-
CMOS or NMOS figured as NMOS input/output pins, then pull-high
Pull-high
I/O
options are available but apply to all 4 pins, not indi-
PA0/PA1 or BZ/BZ vidual pins. Pins PA4~PA7 are always configured as
NMOS input/output pins with pull-high resistors con-
PA3 or PFD
nected. All inputs are Schmitt Trigger types. Pins
PA0, PA1 and PA3 are pin-shared with BZ, BZ and
PFD respectively, the function of which is chosen via
configuration options.
8-bit input Schmitt Trigger port. Each input pin is con-
nected to an internal pull-high resistor. Pins PB0 and
PB1 are pin-shared with INT0 and INT1 respectively.
Pins PB2 and PB3 are pin-shared with TMR0 and
TMR1 respectively.
Bidirectional 4-bit input/output port. A configuration
option determines whether all four pins PC0~PC3 are
configured as CMOS outputs or NMOS input/output
pins. Individual pins cannot be selected to be config-
ured as a CMOS output or as an NMOS input/output
pin. If PC0~PC3 are configured as NMOS input/out-
put pins, then a pull-high option is available but it ap-
plies to all 4 pins, not individual pins. All inputs are
Schmitt Trigger types.
LCD power supply for HT49R50A-1/HT49C50-1.
LCD voltage pump for HT49C50L.
PB0/INT0
PB1/INT1
PB2/TMR0
PB3/TMR1
PB4~PB7
I
¾
PC0~PC3
I/O
CMOS or NMOS
Pull-high
VLCD
I
¾
10
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