參數(shù)資料
型號(hào)： M38853F8-HP
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 47/103頁(yè)
文件大?。?/td> 1580K
代理商： M38853F8-HP
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
46
LPC INTERFACE
LPC interface function is base on Low Pin Count (LPC) Interface
Specification, Revision 1.0. The 3885 supports only I/O read cycle
and
I/O write cycle. There are two channels of bus buffers to the host.
The functions of Input Data Bus Buffer, Output Data Bus Buffer
and Data Bus Buffer Status Register are the same as that of the
8042, 3880 group, 3881 group and 3886 group. It can be written in
or read out from the host controller through LPC interface. LPC in-
terface function block diagram is shown in Figure 43.
Functional input or output pins of LPC interface are shared with
Port 8 (P8
0
–P8
6
). Setting the LPC interface enable bit (bit3 of
LPCCON) to “1” enables LPC interface. Enabling channel i (i = 0,
1) of the data bus buffer is controlled by the data bus buffer i (i =
0, 1) enable bits (bit 4 or bit 5 of LPCCON).
The slave addresses of the data bus buffer channel i (i = 0, 1) are
definable by setting LPCi (i = 0, 1) address register H/L
(LPC0ADL, LPC0ADH, LPC1ADL, LPC1ADH). The bit 2 value of
LPCi address register L is not decoded. This bit returns “0” when
the internal CPU read. The bit 2 of slave address is latched to
XA2i flag when the host controller writes the data.
The input buffer full (IBF) interrupt occurs when the host controller
writes the data. The output buffer empty (OBE) interrupt is gener-
ated when the host controller reads out the data. The 3885
merges two input buffer full (IBF) interrupt requests and two output
buffer empty (OBE) interrupt requests as shown in Figure 44.
Table 16 Function explanation of the control pin in LPC interface
P8
0
/LAD
0
I/O
These pins communicate address, control and data
information between the host and the data bus buffer of
the 3885.
P8
1
/LAD
1
I/O
P8
2
/LAD
2
I/O
P8
3
/LAD
3
I/O
P8
4
/LFRAME
I
Input the signal to indicate the start of new cycle and
termination of abnormal communication cycles.
I
Input the LPC synchronous clock signal.
P8
5
/LRESET
I
Input the signal to reset the LPC interface function.
Pin name
Input/
Output
Function
P8
6
/LCLK
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