668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 169

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

Specifications of 668-0011

• Rohs Status: RoHS non-compliant
• 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
• Features: -
• Other names: 316-1043

19.2 Dependencies
19.2.1 I/O Pins
When the slave port is enabled by writing to SPCR, the following pins are enabled for
slave port mode. Note that enabling the slave port mode will override any general-purpose
I/O or external I/O bus settings for these pins; when the slave port is enabled they will per-
form slave port functionality.
19.2.2 Clocks
All slave port operations are based on the processor clock.
19.2.3 Interrupts
If slave port interrupts are enabled, a slave port interrupt will occur on the slave device
whenever the master writes to SPD0R. The /SLAVEATTN pin is asserted whenever the
slave device writes to SPD0R. Either if these conditions is cleared when either the master
or slave reads or writes any of the slave port registers.
The slave port interrupt vector is in the IIR at offset 0x080. It can be set as Priority 1, 2, or
3 by writing to SPCR.
Chapter 19 Slave Port
PB4–PB5
PA0–PA7
* Introduced with Rabbit 3000A chip
Pin(s)
PB7
PB6
PB3
PB2
PE7
/SLAVEATTN
Slave Port
SD0–SD7
SA0–SA1
/ASCS
Signal
/SWR
/SRD
/SCS
Table 19-2. Slave Port Pin Functionality
*
Bidirectional Slave data bus
Direction
Output
Input
Input
Input
Input
Input
Slave interrupt request (output)
Alternate slave chip select
Slave address bus
Slave port read strobe
Slave port write strobe
Slave chip select
Functionality
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