参数资料
型号: ST72E331N4D0
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP56
封装: 0.600 INCH, WINDOWED, CERAMIC, SDIP-56
文件页数: 74/107页
文件大小: 691K
代理商: ST72E331N4D0
69/107
ST72E331 ST72T331
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
EXTENDED RECEIVE PRESCALER DIVISION
REGISTER (ERPR)
Read/Write
Reset Value: 0000 0000 (00h)
Allows setting of the Extended Prescaler rate divi-
sion factor for the receive circuit.
Bit 7:1 = ERPR[7:0]
8-bit Extended Receive Pres-
caler Register.
The extended Baud Rate Generator is activated
when a value different from 00h is stored in this
register. Therefore the clock frequency issued
from the 16 divider (see Figure 3.) is divided by the
binary factor set in the ERPR register (in the range
1 to 255).
The extended baud rate generator is not used af-
ter a reset.
EXTENDED TRANSMIT PRESCALER DIVISION
REGISTER (ETPR)
Read/Write
Reset Value:0000 0000 (00h)
Allows setting of the External Prescaler rate divi-
sion factor for the transmit circuit.
Bit 7:1 = ETPR[7:0]
8-bit Extended Transmit Pres-
caler Register.
The extended Baud Rate Generator is activated
when a value different from 00h is stored in this
register. Therefore the clock frequency issued
from the 16 divider (see Figure 3.) is divided by the
binary factor set in the ETPR register (in the range
1 to 255).
The extended baud rate generator is not used af-
ter a reset.
Table 17. SCI Register Map and Reset Values
70
ERPR
7
ERPR
6
ERPR
5
ERPR
4
ERPR
3
ERPR
2
ERPR
1
ERPR
0
70
ETPR
7
ETP R
6
ETPR
5
ETP R
4
ETPR
3
ETP R
2
ETPR
1
ETP R
0
Address
(Hex.)
Register
Name
7654
3
210
50
SR
Reset Value
TDRE
1
TC
1
RDRF
0
IDLE
0
OR
0
NF
0
FE
0
-
0
51
DR
Reset Value
DR7
-
DR6
-
DR5
-
DR4
-
DR3
-
DR2
-
DR1
-
DR0
-
52
BRR
Reset Value
SCP1
0
SCP0
0
SCT2
-
SCT1
-
SCT0
-
SCR2
-
SCR1
-
SCR0
-
53
CR1
Reset Value
R8
-
T8
--
M
-
WAKE
---
-
54
CR2
Reset Value
TIE
0
TCIE
0
RIE
0
ILIE
0
TE
0
RE
0
RWU
0
SBK
0
55
ERPR
Reset Value
ERPR7
0
ERPR6
0
ERPR5
0
ERPR4
0
ERPR3
0
ERPR2
0
ERPR1
0
ERPR0
0
57
ETPR
Reset Value
ETPR7
0
ETPR6
0
ETPR5
0
ETPR4
0
ETPR3
0
ETPR2
0
ETPR1
0
ETPR0
0
69
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