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参数资料
| 型号： | YSS943-VZ |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 封装： | LEAD FREE, PLASTIC, LQFP-144 |
| 文件页数： | 8/36页 |
| 文件大小： | 831K |
| 代理商： | YSS943-VZ |
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YSS944/943/940
16
Chip 0
nMICS
IOPORT3 to IOPORT0 = X
(3) Microprocessor interface connection example
When microprocessor interface pins are shared by several LSIs, the target LSI can be selected by either of the
following two methods.
Design nMICS pins dedicated to specific LSIs.
When nMICS pins are shared by several LSIs, use the ChipAdr register to select the target LSI.
These two examples are described below.
(a) Microprocessor interface connection example 1 (single LSI)
Default value after hardware reset is CAE = 0,
so there is no need to write to ChipAdr.
<1> A write operation to ChipAdr as the register access immediately after the falling edge of nMICS is
valid.
In the above figure, an example of writing when CAE = 0 and CA[3:0] = 4 is illustrated.
<2> A write operation to ChipAdr as the register access immediately after the falling edge of nMICS is
invalid.
<3> ChipAdr can be read at any time.
In this case, the write operation (<2>) is disabled, so the write results from <1> are read.
<4> Registers cannot be accessed while accessing on-chip memory.
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