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96 Rabbit 3000 Microprocessor
Table 7-14. Rabbit 3000 Reset Sequence and State of I/O Pins
Pin Name Direction
/RESET Low
*
Recognized by CPU
Post-Reset
†
/RESET Input
Low or High High
CLK Output
High Operational
CLK32K Input
Not Affected Not Affected
RESOUT Output
High Low
XTALA1 Input
Not Affected Not Affected
XTALA2 Output
Not Affected Not Affected
A[19:0] Output
Last Value 0x00000
D[7:0] Bidirectional
High Z High Z
/WDTOUT Output
High High
STATUS Output
High
Operational
(as /IFTCH1)
SMODE[1:0] Input
Not Affected Not Affected
/CS0 Output
High Operational
/CS1 Output
High Z High
/CS2 Output
High High
/OE0 Output
High Operational
/OE1 Output
High High
/WE0 Output
High High
/WE1 Output
High High
/BUFEN Output
High High
/IORD Output
High High
/IOWR Output
High High
PA[7:0] Input/Output zzzzzzzz zzzzzzzz
PB[7:0] Input/Output 00zzzzzz 00zzzzzz
PC[7:0] 4 In/4 Out z0z1z1z1 z0z1z1z1
PD[7:0] Input/Output zzzzzzzz zzzzzzzz
PE[7:0] Input/Output zzzzzzzz zzzzzzzz
PF[7:0] Input/Output zzzzzzzz zzzzzzzz
PG[7:0] Input/Output zzzzzzzz zzzzzzzz
* A low is recognized internally by the processor after a reset
† The default state of the I/O ports after the completion of the reset and initializa-
tion sequences