Hitachi AP1 Data Book page 187

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LCD-IV
ing an external interrupt to the LCD-IV.
Refer to INTERRUPTS for additional infonnation.
• V
I ,
V
2
and V
3
Power for liquid crystal display are supplied to the LCD-IV
usingthesepins(Vcc~VI ~V2 ~V3 ~GND).
• Roo
to
R03
These 4 lines are a 4-bit input channel.
Refer to INPUT/OUTPUT for additional infonnation.
• RIo
to
R13, R20
to
R23
These 8 lines are arranged into two 4-bit Input/Output
common channels.
The 4-bit register is attached to this channel. This channel
is directly addressed by the operand of an instruction. I/O
configuration of each pin can be specified among Open Drain
and CMOS using a mask option.
Refer to INPUT/OUTPUT for additional infonnation.
• R30 to R33
These 4 lines are a 4-bit output channel.
4-bit register is attached to this channel. This channel is
directly addressed by the operand of an instruction. I/O con-
figuration of each pin can be specified among Open Drain and
CMOS using a mask option.
Refer to INPUT/OUTPUT for additional infonnation.
• Do to
013
These are 14 discrete signals which can be configured as
Input/Output lines.
Refer to INPUT/OUTPUT for additional information.
• 014/XO,0Is/XI
D I4 /XO and DIS/XI require a mask option in the following
3 types.
• Discrete I/O (common tenninal)
• Crystal circuit connecting terminals (with internal halt)
• Crystal circuit connecting terminals (no internal halt)
Refer to INPUT/OUTPUT for additional infonnation.
• COMI to COM.
These pins are common tenninals for liquid crystal display.
Refer to LIQUID CRYSTAL DISPLAY for additional in-
fonnation.
• SEGI
to
SEG32
These pins are segment tenninals for liquid crystal display.
• OSCILLATOR
The user can specify a resistor, or a ceramic filter circuit or
an external oscillator by "MASK OPTION U ST".
(1) External Clock
Oscillator
OSC.
Open
(2)
Resistor
(3)
Ceramic Filter (This is not applied to Low Voltage Operation Version.!
C.
-f OSC.
Rf
~~~~iC -~""""\M,_~
OSC
2
C
2
Ad
GND
(NOTE) Configuration and constant
of external parts are depend
upon each applied ceramic
filter.
The ceramic filter oscillation does not apply when using "Halt" and not
resetting at time of "Halt" cancellation.
This circuit is the example of the typical use. As the oscillation character-
istics is not guaranteed, please consider end examine the circuit constants
carefully on your application.
• ROM
• ROM Address Space
ROM is used as a memory for the instructions and the pat-
terns (constants). The instruction used in the LCD-IV consists
of 10 bits. These 10 bits are called "a word", which is a unit
for writing into ROM
The ROM address has been split into two banks.
Each bank is composed of 32 pages (64 words/page).
The ROM capacity is 4,096 words (1 word
=
1 0 bits) in all.
All addresses can contain both the instructions and the pat-
terns (constants).
The ROM address space is shown in Figure 1.
185