20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 205

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

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

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.
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