HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 75
HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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3.2.4
In normal operating mode, all functional modules in the SCA are active and communication is
enabled. The SCA operates as follows in this mode:
RESET
RD
CLK (CPU
modes 1, 2, 3)
CLK
(CPU mode 0)
WR/R/W
BHE/HDS
WAIT
BUSY
D to D
HOLD/
BUSREQ
BEO
INT
A /LDS
AS
A to A
A to A
0
0
8
1
The MSCI, DMAC, and timers perform their regular functions with regular performance.
Interrupt requests (INT) can be generated.
The SCA can become the bus master through the action of its on-chip bus arbiter.
15
23
7
Normal Operating Mode
6 clock cycles or more
Figure 3.2 Reset Mode Timing
Input
Output
Input
Input
Input (open drain)
High impedance
High impedance
Input
Input
Input
Reset mode
Rev. 0, 07/98, page 59 of 453
Normal
operating
mode
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