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參數(shù)資料
| 型號(hào)： | μPD703003A |
| 廠商： | NEC Corp. |
| 英文描述： | 16/32 Bit Single Chip Microcontrollers(16/32位單片微控制器) |
| 中文描述： | 16/32位單片機(jī)微控制器（16/32位單片微控制器） |
| 文件頁(yè)數(shù)： | 77/323頁(yè) |
| 文件大小： | 1277K |
| 代理商： | ΜPD703003A |
57
CHAPTER 4 BUS CONTROL FUNCTION
CHAPTER 4 BUS CONTROL FUNCTION
The V853 is provided with an external bus interface function by which external memories such as ROM and RAM,
and I/O can be connected.
4.1 Features
16-bit data bus
External devices connected through multiplexed I/O port pins
Wait function
Programmable wait function, capable of inserting up to 3 wait states per 2 blocks
External wait control through WAIT input pin
Idle state insertion function
Bus mastership arbitration function
Bus hold function
4.2 Bus Control Pins
The following pins are used for interfacing to external devices:
External Bus Interface Function
Corresponding Port (pins)
Address/data bus (AD0 to AD7)
Port 4 (P40 to P47)
Address/data bus (AD8 to AD15)
Port 5 (P50 to P57)
Address bus (A16 to A19)
Port 6 (P60 to P63)
Read/write control (LBEN, UBEN, R/W, DSTB)
Port 9 (P90 to P93)
Address strobe (ASTB)
Port 9 (P94)
Bus hold control (HLDRQ, HLDAK)
Port 9 (P95, P96)
External wait control (WAIT)
—
The bus interface function of each pin is enabled by the memory expansion mode register (MM). In ROM-less
mode, the bus interface function of each pin is unconditionally enabled by the MODE pin setting in the μPD703003
and 70F3003. For the details of specifying an operation mode of the external bus interface, refer to
3.4.7 Memory
expansion mode register (MM)
.
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