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參數(shù)資料
| 型號(hào)： | UPD784031YGK-BE9 |
| 廠商： | NEC Corp. |
| 英文描述： | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16-/8-bit的單晶片微控制器 |
| 文件頁(yè)數(shù)： | 49/88頁(yè) |
| 文件大?。?/td> | 464K |
| 代理商： | UPD784031YGK-BE9 |
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49
μ
PD784031Y
9.3 Programmable Wait
The memory space can be divided into eight spaces and wait states can be independently inserted in each of these
spaces while the RD and WR signals are active. Even when a memory with a different access time is connected, therefore,
the efficiency of the entire system does not drop.
In addition, an address wait function that extends the active period of the ASTB signal is also provided so as to have
a sufficient address decode time (this function can be set to the entire space).
9.4 Pseudo Static RAM Refresh Function
The following refresh operations can be performed:
Pulse refresh
: A bus cycle that outputs a refresh pulse to the REFRQ pin at a fixed cycle is inserted. The
memory spaces is divided into eight spaces, and a refresh pulse can be output from the
REFRQ pin while a specified memory space is accessed. Therefore, the normal memory
access is not kept to wait by the refresh cycle.
Power-down self-refresh: The low level is output to the REFRQ pin in the standby mode to retain the contents of the
pseudo static RAM.
9.5 Bus Hold Function
A bus hold function is provided to facilitate connection of a DMA controller. When a bus hold request signal (HLDRQ)
is received from an external bus master, the address bus, address/data bus, and ASTB, RD, and WR pins go into a high-
impedance state when the current bus cycle has been completed. This makes the bus hold acknowledge (HLDAK) signal
active, and releases the bus to the external bus master.
Note that, while the bus hold function is used, the external wait function and pseudo static RAM refresh function cannot
be used.
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| UPD784031Y | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD784031YGC-3B9 | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD784031YGC-8BT | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD784037YGC | TRANS PREBIASED DUAL NPN SOT363 |
| UPD784037 | 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS |
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| UPD784218AGC-382-8EU-NRE-A | 制造商:Renesas Electronics Corporation 功能描述: |
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| UPD784935AGF-113-3BA | 制造商:NEC Electronics Corporation 功能描述: |
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