參數(shù)資料
型號(hào): UPD70216HLP-20
廠商: NEC Corp.
英文描述: V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR
中文描述: V40HLTM,V50HLTM 16 / 8,16位微處理器
文件頁(yè)數(shù): 27/110頁(yè)
文件大?。?/td> 625K
代理商: UPD70216HLP-20
27
μ
PD70208H, 70216H
Data Sheet U13225EJ4V0DS00
7.
WCU (WAIT CONTROL UNIT)
The WCU has the function of automatically inserting a wait state (TW) of 0 to 3 clock cycles in a CPU, DMAU or REFU
bus cycle.
7.1
FEATURES
Automatic setting of 0 to 3 waits for a CPU memory bus cycle
1M-byte memory space can be divided into 5
64K-byte I/O space can be divided into 3
Automatic setting of 0 to 3 waits for an external I/O cycle
Automatic setting of 0 to 3 waits for a DMA cycle
Automatic setting of 0 to 3 waits for a refresh cycle
Same as V40 and V50 directly after a reset (memory space divided into 3, no division of I/O space)
Figure 7-1. Example of Memory Space Division
Remark
The division specification and the size of each block are set by means of a system I/O area register.
FFFFFH
00000H
1 M-Byte
Memory Area
Upper Memory Block
Middle Memory Block
Lower Memory Block
Lower Sub
Memory Block
Upper Sub
Memory Block
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