H49R50A-1 Datasheet, PDF (23/45 Pages) Holtek Semiconductor Inc – LCD Type 8-Bit MCU

HT49R50A-1/HT49C50-1/HT49C50L
Options
The following shows the options in the devices. All these options should be defined in order to ensure proper system
functioning.
Options
OSC type selection.
This option is to determine whether an RC or Crystal or 32768Hz crystal oscillator is chosen as system clock.
WDT Clock source selection.
RTC and Time Base. There are three types of selection: system clock/4 or RTC OSC or WDT OSC.
WDT enable/disable selection.
WDT can be enabled or disabled by options.
CLR WDT times selection.
This option defines how to clear the WDT by instruction. ²One time² means that the ²CLR WDT² can clear the WDT.
²Two times² means that if both of the ²CLR WDT1² and ²CLR WDT2² have been executed, only then will the WDT be
cleared.
Time Base time-out period selection.
The Time Base time-out period ranges from clock/2¹² to clock/2¹⁵. ²Clock² means the clock source selected by op-
tions.
Buzzer output frequency selection.
There are eight types of frequency signals for buzzer output: Clock/2²~Clock/2⁹. ²Clock² means the clock source se-
lected by options.
Wake-up selection.
This option defines the wake-up capability. External I/O pins (PA only) all have the capability to wake-up the chip
from a HALT by a falling edge.
Pull-high selection.
This option is to decide whether the pull-high resistance is visible or not on the PA0~PA3 and PC. (PB and PA4~PA7
are always pull-high)
PA0~PA3 and PC CMOS or NMOS selection.
The structure of PA0~PA3 and PC each 4 bits can be selected as CMOS or NMOS individually. When the CMOS is
selected, the related pins only can be used for output operations. When the NMOS is selected, the related pins can
be used for input or output operations. (PA4~PA7 are always NMOS)
Clock source selection of Timer/Event Counter 0. There are two types of selection: system clock or system clock/4.
Clock source selection of Timer/Event Counter 1. There are three types of selection: TMR0 overflow, system clock or
Time Base overflow.
I/O pins share with other functions selection.
PA0/BZ, PA1/BZ: PA0 and PA1 can be set as I/O pins or buzzer outputs.
PA3/PFD: PA3 can be set as I/O pins or PFD output.
LCD common selection.
There are three types of selection: 2 common (1/2 duty) or 3 common (1/3 duty) or 4 common (1/4 duty). If the 4 com-
mon is selected, the segment output pin ²SEG32² will be set as a common output.
LCD bias power supply selection.
There are two types of selection: 1/2 bias or 1/3 bias for HT49R50A-1/HT49C50-1.
LCD bias type selection.
This option is to decide what kind of bias is selected, R type or C type for HT49R50A-1/HT49C50-1.
LCD driver clock selection.
There are seven types of frequency signals for the LCD driver circuits: f_S/2²~f_S/2⁸. ²f_S² means the clock source selec-
tion by options.
LCD ON/OFF at HALT selection
LVR selection.
LVR has enable or disable options
LVD selection.
LVD has enable or disable options
PFD selection.
If PA3 is set as PFD output, there are two types of selection; One is PFD0 as the PFD output, the other is PFD1 as the
PFD output. PFD0, PFD1 are the timer overflow signals of the Timer/Event Counter 0, Timer/Event Counter 1 re-
spectively.
Rev. 2.00
23
November 29, 2005