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Development Board Hardware
4.4.4.5
BACKLIGHT CONTROL
Depending on the display glass being used, backlight control is provided as an
ON/OFF signal, or as a PWM pulse train for a continuous range of brightness. Jumper
JP12 (Figure 4-7, callout 2) selects which signal is enabled on display connector V1.
By default, backlight control is disconnected (position 2-4).
? To enable BKLT_EN (ON/OFF), set JP12 to bridge 2-3.
? To enable BKLT_PWM (PWM controlled contrast), set JP12 to bridge 1-2.
Note:
4.4.5
If either of the backlight control modes is selected, access to the UART will be
for more information.
On-Board External Memory
The PIC24FJ256DA210 can be used to create a graphics solution without any external
memory resources. However, in cases where the application requires a higher color
depth (8 bits per pixel or more), or larger storage for images and data, external SRAM
and Flash memory devices are provided on the development board.
Both SRAM and parallel Flash memory can be enabled at the same time. The
Enhanced Parallel Master Port module (EPMP) accesses memory on both devices with
the same data and address lines. PMCS1 is used as the Chip Select signal for the
SRAM, and PMCS2 is used for the parallel Flash. Note, however, that configuring a
memory addressing size option for one device selects the same size for the other.
If all 19 address lines of the EPMP are not required, PMA17 and PMA18 can be con-
figured for other purposes. PMA17 can be used to control LED D4, while PMA18 can
be reconfigured to function as an I/O on the PICtail Plus Expansion port.
For more information on using the EPMP, refer to “Enhanced Parallel Master Port
(EPMP)” (DS39730) for more information.
4.4.5.1
EXTERNAL SRAM
The PIC24FJ256DA210 Development Board is provided with 512 Kbyte of external
SRAM, populating U6. By default, only 256 out of the 512 KByte is enabled; this allows
PMA17 to control LED D4 in the default board default configuration. If required, the
SRAM may be upgraded to 1 MByte by replacing U6 with a different device. The SRAM
interfaces with the microcontroller through the EPMP interface. Use of external SRAM
is optional if internal 24/96 Kbyte RAM of PIC24FJ256DA210 cannot accommodate the
required frame buffer size for a specific color depth and resolution combination.
SRAM access time is an important aspect of the interface to the EPMP port. In most
QVGA based applications, the use of a 55 ns access time is enough to meet the refresh
requirements of the display. The use of a 10 ns access time SRAM on the board is due
to the fact that VGA resolution display, which requires more bandwidth, can also be
driven by the development board.
The SRAM can be configured for one of three memory address ranges, shown in
TABLE 4-7:
SRAM MEMORY OPTIONS
Active EPMP
Size
JP11
R63
Address
Recommended Part #s
Lines
256 Kbyte
Open
Open
PMA<16:0>
IS61LV25616AL-10TL
(default)
IDT71V416S
512 Kbyte
1 Mbyte
Bridged
Bridged
Open
0 ?
PMA<17:0>
PMA<18:0>
AS7C34098A
IS61WV51216BLL-10TLI
? 2010 Microchip Technology Inc.
DS51911A-page 43
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