HD64570 Datasheet, PDF (61/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Table 2.5 Data Lines
Pin Number
Symbol
D₀−D₇
CP-84
36−43
FP-88
49−56
D₈*¹âˆ’D₁₅*¹ 45, 47−53 58, 60−66
*1: Not connected
Input/
Output
Description
Input/
output
(Three-
state
Data bus:
CPU modes 0−3
Normal mode
Input/output lines for the
8 low- order bits of the 16-bit
bidirectional data bus.
Reset mode High impedance.
System stop High impedance.
mode
Input/
output
(Three-
state)
Data bus:
CPU modes 0, 2, 3
Normal mode
Input/output lines for the
8 high-order bits of the 16-bit
bidirectional data bus.
Reset mode High impedance.
System stop High impedance.
mode
CPU mode 1
All modes
*1: Always high.
Leave unconnected,
or pull up to V_CC.
Rev. 0, 07/98, page 45 of 453