rsc-464 ETC-unknow, rsc-464 Datasheet - Page 12

• Manufacturer Part Number: rsc-464
• Description: Speech Recognition Processor
• Manufacturer: ETC-unknow

RSC-464
(For example, if register E7.Bit 4 is set high, and register E6.Bit 4 is low, then pin P0.4 is an input without a pull-up
device.)
After reset, pins P0.0-P0.7 and P2.5-P2.7 are set to be digital inputs with weak pull-ups, and pins P2.0-P2.4 are
configured as analog input pins with no pull-ups. Being reset as an input and lightly pulled to a known (high) state
ensures minimum power consumption as a default beginning. Eight of these pins (Port P0) can also be configured
as inputs to control IO Wakeup events. (see “Power and Wakeup Control” section).
P2.0, P2.1, P2.3, and P2.4 can be configured as comparator inputs. P2.2 can be configured as a comparator
reference. Some or all of P2.0-P2.4 can be configured as digital inputs by the use of the “cmpCtl” register (register
D4) Bits[2:0] (see “Comparator Unit” section)
Note: When configuring P2.0-P2.4 as digital inputs the associated weak pull-up should be selected as shown
above.
P0.0 and P0.2 can be configured as External Interrupts (see “Interrupts” section). P0.1 can be configured in input
mode as a gate for an external event counter. (See “Timers/Counters” Section)
Registers E5 (“p0In”) and E4 (“p0Out”), and DD (“p2In”) and DC (“p2Out”), provide paths for data input and data
output on P0 and P2, respectively. The input registers are actually buffers that record the value at the ports at the
time they are read. The output registers latch the data written to them and express it on the ports when the ports
are configured as an output.
Following is a summary of the general purpose I/O control registers:
GPIO during powerdown
GPIO should be put in input mode and a known state (e.g. light pull-up) whenever possible to conserve power, and
especially in powerdown mode to achieve the specified minimum supply current consumption.
12
B bit
0
0
1
1
Register
0DCH Read/Write
0DDH Read
0DEH Read/Write
0DFH Read/Write
0E4H
0E5H
0E6H
0E7H
A bit
0
1
0
1
Read/Write
Read
Read/Write
Read/Write
Port Pin Function
Input - Weak Pull-up
Input - Strong Pull-up
Input - No pull-up
Output
P2[0:7] (port 2) output register. Cleared by reset.
Port 2 input.
Port 2 Control Register A. Cleared by reset.
Port 2 Control Register B. Bits[7:5] cleared by reset.
P0[0:7] (port 0) output register. Cleared by reset.
Port 0 input.
Port 0 Control Register A. Cleared by reset.
Port 0 Control Register B. Cleared by reset.
Bits[4:0] set by reset
P/N 80-0282-A
Preliminary Data Sheet
© 2005 Sensory Inc.