参数资料
型号: ST72T121J2B6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, SHRINK, PLASTIC, DIP-42
文件页数: 58/93页
文件大小: 597K
代理商: ST72T121J2B6
61/93
ST72E121 ST72T121
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
DATA REGISTER (DR)
Read/Write
Reset Value: Undefined
Contains the Received or Transmitted data char-
acter, depending on whether it is read from or writ-
ten to.
The Data register performs a double function (read
and write) since it is composed of two registers,
one for transmission (TDR) and one for reception
(RDR).
The TDR register provides the parallel interface
between the internal bus and the output shift reg-
ister (see Figure 32).
The RDR register provides the parallel interface
between the input shift register and the internal
bus (see Figure 32).
BAUD RATE REGISTER (BRR)
Read/Write
Reset Value: 00xx xxxx (XXh)
Bit 7:6= SCP[1:0]
First SCI Prescaler
These 2 prescaling bits allow several standard
clock division ranges:
Bit 5:3 = SCT[2:0]
SCI Transmitter rate divisor
These 3 bits, in conjunction with the SCP1 & SCP0
bits define the total division applied to the bus
clock to yield the transmit rate clock in convention-
al Baud Rate Generator mode.
Note: this TR factor is used only when the ETPR
fine tuning factor is equal to 00h; otherwise, TR is
replaced by the ETPR dividing factor.
Bit 2:0 = SCR[2:0]
SCI Receiver rate divisor.
These 3 bits, in conjunction with the SCP1 & SCP0
bits define the total division applied to the bus
clock to yield the receive rate clock in conventional
Baud Rate Generator mode.
Note: this RR factor is used only when the ERPR
fine tuning factor is equal to 00h; otherwise, RR is
replaced by the ERPR dividing factor.
70
DR7
DR6
DR5
DR4
DR3
DR2
DR1
DR0
70
SCP1
SCP0
SCT2
SCT1
SCT0
SCR2
SCR1
SCR0
PR Prescaling factor
SCP1
SCP0
10
0
30
1
41
0
13
1
TR dividi ng factor
SCT2
SCT1
SCT0
1
000
2
001
4
010
8
011
16
100
32
101
64
110
128
1
RR dividi ng factor
SCR2
SCR1
SCR0
1
000
2
001
4
010
8
011
16
100
32
101
64
110
128
1
61
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