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Serial Interface
This is the 2-channel, 1-system serial interface, which has three functions; a three-wire serial interface, two-wire serial
interface and full-duplex UART functions.
The serial interface communicates with the extended LSI and microcomputer using CMOS serial interface pins
SCK1/TX1 (P3-0), SDIO1 (P3-1) and SI1 (P3-2) or N-ch open-drain pins SCK2/TX2 (P8-2), SDIO2 (P8-3) and SI2 (P8-1)
(that can accept voltage up to 5.5V). When the serial interface operation is finished, an interruption is issued.
The serial interface consists of the 4-bit input/output serial counter, the 12-bit serial output latch, the 12-bit serial input
latch and the control circuit that controls them.
The basic operations of the serial interface are as follows. For the serial output, the serial data output bit data is outputted
as specified by the serial output counter, and the serial counter is moved up or down by the serial clock so that the data is
outputted to the serial output pin in the specified order. For the serial input, serial input data is sequentially taken to the
serial latch specified by the serial input counter as in the case of the serial input.
1. Control Port and Data Port for Serial Interface
The serial interface executes control and data transmission and receiving using the control port and data port. These ports
are assigned in I/O map data port 2 and accessed by the OUT1/IN1 instruction.
Serial interface control 1
シリアルインタフェースコントロール
Ｙ 1
Ｙ 2
φL11(7)
M0
M1
モード設定
Mode setting
１
Ｙ 4
Ｙ 8
シリアルインタフェース端子の選択
PSEL
SIO
シリアルインタフェースモード設定
Serial interface mode setting
68
Selection of serial interface pin
PSEL
SIO
シリアルインタフェース端子
Serial interface pin
*
0
各端子はI/Oポート動作します
Each pin for I/O port operation
0
I/Oポート3(CMOS構造)
I/O port 3 (CMOS)
1
1
I/Oポート8(Nchオープンドレイン構造)
I/O port 8 (N-ch open-drain)
M1
M0
シリアルインタフェースモード
Serial interface mode
0
0
動作停止
Operation stop
0
1
2線式インタフェース
2-wired interface
1
0
3線式インタフェース
3-wired interface
1
1
UART
TC9349AFG
。
2006-02-24
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