20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 205
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
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Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
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23.3 Operation
23.3.1 External I/O Bus
The following steps must be taken before using external I/O bus:
1. Enable the external I/O bus by writing to SPCR.
2. Set the I/O timing for a particular device by writing to the appropriate IBxCR register
Once the external I/O bus is enabled, all memory read/write instructions prefixed with an
IOE will go to either the memory bus or external I/O bus, depending on the setup in that
bank’s IBxCR register.
23.3.2 I/O Strobes
The following step must be taken before using an I/O strobe:
1. Set the strobe type and timing for a particular device by writing to the appropriate
On startup, the I/O strobes are set as chip selects with 15 wait states, read-only, active-low
signaling, and will use the external I/O bus. These settings will be used for the dedicated
I/O strobe pins /IORD, /IOWR, and /BUFEN whenever an external I/O write occurs even
if not I/O strobe signals are being output on parallel port pins.
Chapter 23 External I/O Control
for the I/O bank desired.
IBxCR register for the I/O bank desired.
195
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