p89lpc9402 NXP Semiconductors, p89lpc9402 Datasheet - Page 40

• Manufacturer Part Number: p89lpc9402
• Description: 8-bit Microcontroller With Accelerated Two-clock 80c51 Core 8 Kb 3 V Byte-erasable ?ash With 32 Segment 4 Lcd Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P89LPC9402_1
Product data sheet
7.27.13.1 I
7.27.12 Input bank selector
7.27.13 Blinker
7.27.14 Input filters
7.27.15 I
The input bank selector loads display data into the display RAM based on the selected
LCD drive configuration. The BANK SELECT command can be used to load display data
in bit 2 in static drive mode or in bits 2 and 3 in 1:2 mode. The input bank selector
functions are independent of the output bank selector.
The LCD controller has a very versatile display blinking capability. The whole display can
blink at a frequency selected by the BLINK command. Each blink frequency is a multiple
integer value of the clock frequency; the ratio between the clock frequency and blink
frequency depends on the blink mode selected, as shown in
An additional feature allows an arbitrary selection of LCD segments to be blinked in the
static and 1:2 drive modes. This is implemented without any communication overheads by
the output bank selector which alternates the displayed data between the data in the
display RAM bank and the data in an alternative RAM bank at the blink frequency. This
mode can also be implemented by the BLINK command.
The entire display can be blinked at a frequency other than the nominal blink frequency by
sequentially resetting and setting the display enable bit E at the required rate using the
MODE SET command.
Table 9.
Blink modes 0.5 Hz, 1 Hz and 2 Hz, and nominal blink frequencies 0.5 Hz, 1 Hz and 2 Hz
correspond to an oscillator frequency (f
frequency range is 397 Hz to 3046 Hz.
The LCD controller acts as an I
subaddress inputs A0, A,1 and A2 are tied to V
To enhance noise immunity in electrically adverse environments, RC low-pass filters are
provided on the SDA and SCL lines.
The I
not respond to a read access.
Blink mode
Off
2 Hz
1 Hz
0.5 Hz
2
2
C-bus controller
C-bus slave addresses
2
C-bus slave address is 0111 0000. The LCD controller is a write-only device and will
Blinking frequencies
Rev. 01 — 22 April 2009
8-bit microcontroller with accelerated two-clock 80C51 core
Normal operating mode ratio Normal blink frequency
-
f
f
f
osc(LCD)
osc(LCD)
osc(LCD)
2
C-bus slave receiver. In the P89LPC9402 the hardware
/768
/1536
/3072
osc(LCD)
) of 1536 Hz at pin CLK. The oscillator
SS
setting the hardware subaddress = 0.
Blinking off
2 Hz
1 Hz
0.5 Hz
Table
P89LPC9402
9.
© NXP B.V. 2009. All rights reserved.
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