20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 111

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

12.2.3 Other Registers
12.2.4 Interrupts
External interrupts can be accepted from pins PE5, PE4, PE1 or PE0; see Chapter 7 for
more details.
12.3 Operation
The following steps must be taken before using Parallel Port E.
1. Select the desired input/output direction for each pin via PEDDR.
2. Select high/low or open-drain functionality for outputs via PEDCR.
3. If an alternative peripheral output function is desired for a pin, select it by via PEALR
Once the port is set up, data can be read or written by accessing PEDR. The value of an
output pin read in from PEDR will reflect its current output value, but any value written to
an input pin will not appear until that pin becomes an output.
Chapter 12 Parallel Port E
or PEAHR and then enable it via PEFR. Refer to the appropriate peripheral chapter for
further use of that pin.
SACR, SBCR, SCCR,
SDCR, SECR, SFCR
ICS1R, ICS2R
QDCR
I0CR, I1CR
DMR0CR, DMR1CR
NACR
SPCR
IHSR, IHTR
Register
Select a Parallel Port E pin as serial data (and
optional clock) input.
Select a Parallel Port E pin as a start/stop condition
input.
Select a Parallel Port E pin as a decoder input.
Select a Parallel Port E pin as an external interrupt
input.
Select a Parallel Port E pin as an external DMA
request input.
Select PE6 as the Ethernet clock input.
Select slave chip select on PE7.
Function
101