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Bus Controller (BC)
8-6
Table 8-5-2 shows the operating status of the external pins concerning BC.
Table 8-5-2 Operating Status of Pins Concerning BC
Operating status SLEEP mode STOP mode HALT mode When bus is relased
Pin
SYSCLK Operate L L Operate
A23 to 0 Operate Maintain Maintain Hi-Z
ADM15 to 0 Operate Hi-Z Hi-Z Hi-Z
D15 to 0 Operate Hi-Z Hi-Z Hi-Z
RAS2 to 1 Operate H H Hi-Z
CAS Operate H H Hi-Z
DCAS1 to 0 Operate H H Hi-Z
DWE Operate H H Hi-Z
CS3 to 0 Operate H H Hi-Z
RE Operate H H Hi-Z
WE1 to 0 Operate H H Hi-Z
BG Operate H H L
AS Operate L L Hi-Z
RWSEL Operate L L Hi-Z
Hi-Z: High impedance
Maintain: Maintains the status from the previous bus cycle
L: "L" level output
H: "H" level output
Note: Because the pins listed in the table at right are all multipurpose, check the status of the external pins of the
LSI in chapter 15, “I/O Ports.”
For details on the operating status of each pin upon reset, refer to appendix D, “Pins and Their Operating
Statuses upon Reset.”