Rabbit 2000 - Page 89

User’s Manual 83
Table 7-10. Rabbit 2000 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
XTALA1 Input
Not Affected Not Affected
XTALA2 Output
Not Affected Not Affected
XTALB1 Input
Not Affected Not Affected
XTALB2 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 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 z0z0z0z0
PD[7:0] Input/Output zzzzzzzz zzzzzzzz
PE[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