参数资料
型号: ST72F321J9T7
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, PLASTIC, TQFP-44
文件页数: 128/176页
文件大小: 1112K
代理商: ST72F321J9T7
ST72321J
55/176
MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK (Cont’d)
Bit 0 = OIF
Oscillator interrupt flag
This bit is set by hardware and cleared by software
reading the MCCSR register. It indicates when set
that the main oscillator has reached the selected
elapsed time (TB1:0).
0: Timeout not reached
1: Timeout reached
CAUTION: The BRES and BSET instructions
must not be used on the MCCSR register to avoid
unintentionally clearing the OIF bit.
MCC BEEP CONTROL REGISTER (MCCBCR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:2 = Reserved, must be kept cleared.
Bit 1:0 = BC[1:0]
Beep control
These 2 bits select the PF1 pin beep capability.
The beep output signal is available in ACTIVE-
HALT mode but has to be disabled to reduce the
consumption.
Table 14. Main Clock Controller Register Map and Reset Values
70
00
BC1
BC0
BC1
BC0
Beep mode with fOSC2=8MHz
00
Off
0
1
~2-KHz
Output
Beep signal
~50% duty cycle
1
0
~1-KHz
1
~500-Hz
Address
(Hex.)
Register
Label
765
4
321
0
002Bh
SICSR
Reset Value
VDS
0
VDIE
0
VDF
0
LVDRF
x0
CFIE
0
CSSD
0
WDGRF
x
002Ch
MCCSR
Reset Value
MCO
0
CP1
0
CP0
0
SMS
0
TB1
0
TB0
0
OIE
0
OIF
0
002Dh
MCCBCR
Reset Value
0
BC1
0
BC0
0
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