參數(shù)資料
型號: μPD750100
廠商: NEC Corp.
英文描述: 32 Bit Single Chip Microcontrollers(32位單片微控制器)
中文描述: 32位單片機微控制器(32位單片微控制器)
文件頁數(shù): 15/66頁
文件大小: 417K
代理商: ΜPD750100
μ
PD705100
15
(2) Lower halfword
During read cycles, data is read from D0-D15.
During write cycles, D0-D15 data read from the write buffer is output to D0-D15.
Figure 4-2 shows the operation for lower halfword access. In this figure, A indicates the lower halfword (low-order
16 bits of the word).
Figure 4-2. Lower Halfword Access
Read cycle
Write cycle
Read buffer
31
Write buffer
31
Internal
operation
unit
Data bus
Internal
operation
unit
Data bus
A
0
16
15
16
15
0
31
A
0
16
15
16
15
0
31
A
A
4.1.2 Word access
Bus cycles in any of three bus states (Ta, Tw1, and Tw2) are used for word access.
During a read cycle, the low-order 16 bits of data and high-order 16 bits of data are sampled from D0-D15 in the
Tw1 and Tw2 state, respectively. During write cycles, the low-order 16 bits of data and high-order 16 bits of data are
output to D0-D15 in the Ta/Tw1 state and Tw2 states, respectively.
Figure 4-3. Read Cycle
Tw1 state
Tw2 state
Read buffer
31
Read buffer
31
Internal
operation
unit
Data bus
Internal
operation
unit
Data bus
B
0
16
15
16
15
0
31
A
0
16
15
16
15
0
31
A
B
A
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