h8s2277 Renesas Electronics Corporation., h8s2277 Datasheet - Page 526
h8s2277
Manufacturer Part Number
h8s2277
Description
Hitachi Single-chip Microcomputer H8s/2276 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S2277.pdf
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15.3
ADDRA to ADDRD are 16-bit registers, and the data bus to the bus master is 8 bits wide.
Therefore, in accesses by the bus master, the upper byte is accessed directly, but the lower byte is
accessed via a temporary register (TEMP).
A data read from ADDR is performed as follows. When the upper byte is read, the upper byte
value is transferred to the CPU and the lower byte value is transferred to TEMP. Next, when the
lower byte is read, the TEMP contents are transferred to the CPU.
When reading ADDR, always read the upper byte before the lower byte. It is possible to read only
the upper byte, but if only the lower byte is read, incorrect data may be obtained.
Figure 15.2 shows the data flow for ADDR access.
504
Bus master
(H'AA)
Bus master
(H'40)
Interface to Bus Master
Lower byte read
Upper byte read
Figure 15.2 ADDR Access Operation (Reading H'AA40)
Bus interface
Bus interface
ADDRnH
ADDRnH
(H'AA)
(H'AA)
ADDRnL
ADDRnL
(H'40)
(H'40)
TEMP
TEMP
(H'40)
(H'40)
Module data bus
Module data bus
(n = A to D)
(n = A to D)
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