LCD Type MCU
In te r n a l C lo c k S o u r c e
P A 0 D a ta
B Z O u tp u t a t P A 0
P A 1 D a ta
B Z O u tp u t a t P A 1
Buzzer Output Pin Control
Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the device
during the programming process. During the development process, these options are selected us-
ing the HT-IDE software development tools. As these options are programmed into the device us-
ing the hardware programming tools, once they are selected they cannot be changed later as the
application software has no control over the configuration options. Although functionally similar,
the OTP and Mask type devices differ in the way that their configuration options are setup. For
OTP type devices these options can be selected using the HT-IDE development tools, and can
therefore be re-configured before the device is programmed, however for Mask type devices the
options are programmed into the device during the manufacturing stage.
All options must be defined for proper system function, the details of which are shown in the tables.
No.
I/O Options
1
2
3
4
5
6
7
8
PA0~PA3: CMOS or NMOS type (nibble option)
PA0~PA3: pull-high enable or disable (nibble option)
PA0~PA7: wake-up enable or disable (bit option)
PC0~PC3: CMOS or NMOS type (nibble option)
PC4~PC7: CMOS or NMOS type (nibble option)
PC0~PC3: pull-high enable or disable (nibble option)
PC4~PC7: pull-high enable or disable (nibble option)
PD0~PD6 or SEG40~SEG46 (bit option) (HT49RU80/HT49CU80 only)
Options
LCD Options
9
10
11
12
13
LCD clock: f
S
/2
2
, f
S
/2
3
, f
S
/2
4
, f
S
/2
5
, f
S
/2
6
, f
S
/2
7
, f
S
/2
8
LCD duty: 1/2, 1/3, 1/4
LCD bias: 1/2, 1/3 (HT49C30L, HT49C50L, HT49C70L devices are 1/2 bias only)
LCD bias type: R type or C type (HT49C30L, HT49C50L, HT49C70L devices are C type only)
LCD on/off during HALT: enable or disable
110
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