Jameco Electronics 2000 ユーザーズマニュアル
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