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Default operation designation is as RS232 interface with full hardware flow
control.
This is as GM47 except pin 32 (DSR/03) was a digital output pin only,
OUT5. The power up default of OUT5 is commensurate with that of DSR
(OUT5; HI for 10mS then LO, DSR/03; HI for 330mS then LO).
3.3 LED / IO6 (Pin 33)
The LED function pin can be used as a general purpose digital IO when
the flashing LED function is not required. However, this pin does not have
an on-board pull-up resistor. It is required that an external pull-up or pull-
down resistor be provided by the host circuitry when either not used or
when used as a digital input.
3.3.1 Backwards compatibility
Default operation designation is as LED.
This is as GM47.
3.4 IN# / O# (Pins 37 / 32, 36, 38, 40)
When not being used for an alternative function the pins labelled I# and
O# may be used for general purpose inputs or outputs respectively. The
inputs have an on-board 100k pull-up resistor and the outputs are driven
rail-to-rail at 2.75V levels.
3.4.1 Backwards compatibility
Default operation designation is as RS232 interface with full hardware flow
control.
This is as GM47 except pin 32 (DSR/03) was a digital output pin (OUT5).
3.5 UART3 / IO# (Pins 43, 44)
UART3 has been given an alternative function as general purpose I/O.
Both pins may be used for either input or output. However, the TX pin has
a 100kΩ pull-down resistor to ground and the RX pin has a 100kΩ pull-up
resistor to 2.75V. This must be taken into consideration when designing
the host circuit.
3.5.1 Backwards compatibility
Default operation is general purpose inputs.
LZT 123 7733 R1A
Differences between GM47 and GM47r5
9
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