参数资料
型号: M34518E8SP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP32
封装: 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件页数: 114/162页
文件大小: 1149K
代理商: M34518E8SP
Rev.3.01
2005.06.15
page 53 of 157
REJ03B0008-0301
4518 Group
SERIAL INTERFACE
The 4518 Group has a built-in clock synchronous serial I/O which
can serially transmit or receive 8-bit data.
Serial I/O consists of;
serial I/O register SI
serial I/O control register J1
serial I/O transmit/receive completion flag (SIOF)
serial I/O counter
Registers A and B are used to perform data transfer with internal
CPU, and the serial I/O pins are used for external data transfer.
The pin functions of the serial I/O pins can be set with the register
J1.
Table 14 Serial I/O pins
Pin
P20/SCK
P21/SOUT
P22/SIN
Pin function when selecting serial I/O
Clock I/O (SCK)
Serial data output (SOUT)
Serial data input (SIN)
Fig. 42 Serial I/O structure
Table 15 Serial I/O control register
Note: “R” represents read enabled, and “W” represents write enabled.
Note: Even when the SCK, SOUT, SIN pin functions are used, the input of
P20, P21, P22 are valid.
1/8
1/4
1/2
00
01
10
11
Synchronous
circuit
Serial I/O counter (3)
SIOF
Serial I/O
interrupt
INSTCK
P20/SCK
SCK
QS
R
MSB Serial I/O register (8) LSB
SIN
J11 J10
J13J12
Register B (4)
Register A (4)
TSIAB
TABSI
SOUT
P21/SOUT
P22/SIN
SST
instruction
Internal reset signal
J13
0
1
J11
0
1
Serial I/O synchronous clock selection bits
Serial I/O port function selection bits
J12
0
1
0
1
J10
0
1
0
1
Serial I/O control register J1
at RAM back-up : state retained
at reset : 00002
J13
J12
J11
J10
Synchronous clock
Instruction clock (INSTCK) divided by 8
Instruction clock (INSTCK) divided by 4
Instruction clock (INSTCK) divided by 2
External clock (SCK input)
Port function
P20, P21,P22 selected/SCK, SOUT, SIN not selected
SCK, SOUT, P22 selected/P20, P21, SIN not selected
SCK, P21, SIN selected/P20, SOUT, P22 not selected
SCK, SOUT, SIN selected/P20, P21,P22 not selected
R/W
TAJ1/TJ1A
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