HT49R50 Holtek Semiconductor Inc, HT49R50 Datasheet - Page 30

• Manufacturer Part Number: HT49R50
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

No.
10
11
12
13
14
15
16
17
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 com-
mon (1/3 duty) or 4 common (1/4 duty). If the 4 common 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.
LCD bias type selection.
This option is to decide what kind of bias is selected, R type or C type.
LCD driver clock selection. There are seven types of frequency signals for the LCD driver
circuits: f
PFD selection.
If PA3 is set as PFD output, there are two types of selection; One is PFD0 as the PFD out-
put, 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 respectively.
S
/2
2
~f
S
/2
8
. ²f
S
² means the clock source selection by mask option.
Mask Option
30
August 18, 1999
HT49C50