HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 95

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

(1) The BREQ pin is sampled at the start of a T
(2) At the end of the internal operation cycle, the BACK pin goes Low and the CPU releases the bus.
(3) The BREQ pin is sampled at the T
(4) The BACK pin is returned to the High level, ending the bus-right release cycle.
* T
T
ø
A
D –D
RD, WR
R/W, DS
BREQ
BACK
I
X
19
7
: Internal CPU operation state.
: Bus-right released state.
–A
0
0
Figure 3-15 Bus-Right Release Cycle (During Internal CPU Operation)
T
i
*
CPU internal operation
T
i
(1)
T
X
i
state and a High level is detected.
T
75
I
i
state and the Low level is detected.
(2)
T
X
*
Bus-right release cycle
(3)
T
X
T
X
(4)
T
CPU cycle
1