User's Manual

1323x Remote Control Motherboard
1323x Development Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor 4-11
— Nibble (4-bit) parallel mode is used on the LCD and the shift register provides the 4 data bits
and the RS control signal
— The 4-data and RS control are strobed into the LCD via the LCD_CTL0 control signal derived
from MC13233 PTA2 output.
— LCD write mode only is supported; the LCD cannot be read.
— The SPI port is shared with the serial FLASH on the 1323x-MRB. SS must be inactive (high)
when writing to the LCD
• The onboard controller is a member of the Sitronix ST7920 Series family with an integrated
display data RAM and alphanumeric character set
Figure 4-6. 1323x-RCM LCD Interface Circuit
4.2.3.3 36 Pushbutton 6x6 Switch Matrix
The1323x-RCM provides an 36 pushbutton 6x6 switch matrix for user application input interface.
• The matrix utilizes MC13233 KBI inputs
• All switches have interrupt and device wake up capability
• For these 36 switches
— Includes the pushbutton array
— Includes two switches located to the right and two switches to the left of the LCD
— Includes switches SW31 and SW32 located on the bottom (non-component) side of the board
— Does not support the two switches (KB0 and KB1) located near the touchpad.
4.2.3.4 Synaptics Touchpad
A Synaptics
®
Touchpad
™
capacitive touch sensor is mounted on the 1323x-RCM for pointing
functionality.
• The touchpad is approximately 30mm tall x 45mm wide
• Interface to the MCU uses the IIC interface
• The touchpad has a separate interrupt request line that is tied to the KBI1P6 MCU input
• The MCU reset is tied to the touchpad and resets the touchpad whenever a system reset occurs
• The touchpad support two independent KBI signals that are connected to pushbuttons KB0 and
KB1and used for touchpad select functions
• The touchpad is soldered to the 1323x-RCM using two SMT headers
C31
0. 1 UF
R3 2
10K
R31
43
R30
1K
1 3
2
R5 3
5K
V_LC D
Q0
Q1
Q2
Q3
Q4
VSS
1
VDD
2
Vo
3
RS
4
R/W
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
ANODE
15
KATODE
16
DS1
LC D + HD R 1X16 + CON 1 X16
LC D_ CT L0
1
2
J10
HDR 1X2
8-B IT SH IFT REGI STER
3 5
4
2
1
U7
SN 74 AHC T1G08
Q0
3
Q1
4
Q2
5
Q3
6
Q4
10
Q5
11
Q6
12
Q7
13
VCC
14
GND
7
DSA
1
DSB
2
CP
8
MR
9
U6
74AHCT164
V_LC D
V_LCD
R51 3.3K
DN P
SPI_MOSI
SPI_CLK
VCC
V_LC D
C-
A1
C+
B1
V_IN
B3
EN
A3
GND
A2
V_OUT
C1
C2+
C2
C2 -
C3
U10
F AN 5665
C38
2. 2 uF
C44
2 . 2uF
R5 0
0
TP3 3
C45
2.2uF
C46
2. 2 uF
5 V BO OST CHARG E PU MP
LCD
VCC
V_5V
Q0
Q1
Q2
Q3
Q4
CON TRAST ADJ UST
V_LC D
V_LCD