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型號(hào)：	HD6437020VXI
廠商：	Hitachi,Ltd.
英文描述：	SuperH⑩ RISC engine
中文描述：	⑩的SuperH RISC引擎
文件頁(yè)數(shù)：	146/507頁(yè)
文件大?。?/td>	1311K
代理商：	HD6437020VXI

Number of States and Number of Wait States in the Access Cycles to External

Memory Spaces

CPU read cycle, DMAC dual mode read cycle,

DMAC single mode read/write cycle

CPU Write Cycle and

DMAC Dual Mode Write

Cycle (Cannot be

controlled by WCR1)*

Corresponding Bits in

WCR1 and WCR2 = 0

1 cycle fixed;

Corresponding Bits in

WCR1 and WCR2 = 1

2 cycles fixed + wait state from

0, 2, 6 (long

wait available)

Notes: 1. The number of long wait states is set by WCR3.

2. When DRAME = 1, short pitch/long pitch is selected with the WW1 bit of the WCR1.

3. Pin wait cannot be used for the CS7 and

pins of area 3 because they are

multiplexed.

1 cycle + long wait state,

signal ignored

1 cycle + long wait state*

+ wait state from

For the CPU read cycle, DMAC dual mode read cycle and DMAC single mode read/write cycle,

the access cycle is completed in 1 state when the corresponding bits of WCR1 and WCR2 for

areas 1, 3–5, and 7 are cleared to 0 and the

pin input signal is not sampled. When the bits

are set to 1, the

signal is sampled and the number of states is 2 plus the number of wait

states in the

signal is sampled at the rise of the system clock (CK)

directly preceding the second state of the bus cycle and the wait states are inserted as long as the

level is low. When a high level is detected, it shifts to the second state (final state). Figure 8.13

shows the wait state timing when accessing the external memory spaces of areas 1, 3, 4, 5, and 7.

相關(guān)PDF資料	PDF描述
HD6437937	Hardware Manual
HD6433935	Hardware Manual
HD6433935R	Hardware Manual
HD6433936	Hardware Manual
HD6433936R	Hardware Manual

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD6437021C02TE	制造商:Renesas Electronics Corporation 功能描述:
HD6437021CO2TE	制造商:Renesas Electronics Corporation 功能描述:
HD6437021SC02TEV	制造商:Renesas Electronics Corporation 功能描述:
HD6437021SX20	制造商:Renesas Electronics Corporation 功能描述:
HD6437034AC00F	制造商:Renesas Electronics Corporation 功能描述:

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