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71M6513/71M6513H Demo Board User’s Manual
Page: 63 of 112
©
2005-2006 TERIDIAN Semiconductor Corporation
Revision 5.6
2.5.3 RTC
Testing the RTC inside the 71M6513/6513H IC is straightforward and can be done using the serial command
line interface (CLI) of the Demo Code.
To set the RTC and check the time and date, we apply the following sequence of CLI commands:
>M10
LCD display to show calendar date
>RTD05.09.27.3
Sets the date to 9/27/2005 (Tuesday)
>M9
LCD display to show time of day
>RTT10.45.00
Sets the time to 10:45:00. AM/PM distinction: 1:22:33PM = 13:22:33
2.5.4 HARDWARE WATCHDOG TIMER
The hardware watchdog timer of the 71M6513/6513H is disabled when the voltage at the V1 pin is at 3.3V
(V3P3). On the Demo Boards, this is done by plugging in a jumper at TP10 between the V1 and V3P3 pins.
Programming the flash memory or emulation using the ADM51 In-Circuit-Emulator can only
be done when a jumper is plugged in at TP10 between V1 and V3P3.
Conversely, removing the jumper at TP10 will enable the hardware watchdog timer.
2.5.5 LCD
Various tests of the LCD interface can be performed with the Demo Board, using the serial command line
interface (CLI):
Setting the LCD_EN register to 1 enables the display outputs.
Register Name
Address [bits]
R/W
Description
LCD_EN
2021[5]
R/W
Enables the LCD display. When disabled, VLC2, VLC1, and
VLC0 are ground as are the COM and SEG outputs.
To access the
LCD_EN
register, we apply the following CLI commands:
>RI21$
Reads the hex value of register 0x2021
>25
Response from Demo Code indicating the bit 5 is set
>RI21=5
Writes the hex value 0x05 to register 0x2021 causing the display to be switched off
>RI21=25
Sets the
LCD_EN
register back to normal
The 71M6513/6513H provides a charge pump capable of boosting the 3.3VDC supply voltage up to 5.0VDC.
The boost circuit is enabled with the
LCD_BSTEN
register. The 6513 Demo Boards have the boost circuit
enabled by default.
Register Name
Address [bits]
R/W
Description
LCD_BSTEN
2020[7] R/W
Enables
the
LCD voltage boost circuit.
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