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參數(shù)資料
| 型號： | UPD72001C-A8 |
| 廠商： | NEC Corp. |
| 英文描述： | MULTI-PROTOCOL SERIAL CONTROLLERS |
| 中文描述： | 多協(xié)議串行控制器 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大?。?/td> | 206K |
| 代理商： | UPD72001C-A8 |
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μ
PD72001-11, 72001-A8
7
1. PIN FUNCTIONS
The functions of the MPSC can be broadly classified into “system interface functions” that control interfacing with
the host system, and “transmission/reception functions” to transmit or receive data. This section explains the functions
of the pins of the MPSC by classifying the pins into those related to system interfacing and those related to transmission
and reception.
Hereafter, “H” (voltage level satisfying V
IH
in the case of an input pin, or voltage level satisfying V
OH
in the case
of an output pin) and “L” (voltage level satisfying V
IL
in the case of an input pin, or voltage level satisfying V
OL
in the
case of an output pin) are used to indicate the input/output status of a pin.
1.1 Pins Related to System Interface
(1) V
DD
Supply voltage pin
(2) GND
GND pin
(3) RESET ... Input
This pin inputs a signal from an external device to reset the MPSC. When “L” is input to this pin for the duration
of 2 clock cycles (2t
CYK
) or longer, the MPSC is reset (this is called system reset).
As a result of system reset, the transmitter, receiver, and interrupt/DMA functions of the MPSC are disabled, and
the T
X
D pin and general-purpose output pins go high. In this case, because all bits of the control register (CR)
are also reset, CR must be set again if a system reset has been executed.
Table 1-1 shows the status of each pin at system reset, in comparison with the pin status at channel reset (CR0:
D5, D4, D3 = “0, 1, 1”).
The MPSC automatically enters the standby mode at system reset, lowering the power consumption from that
in the normal operation mode.
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