參數(shù)資料
型號: ST2202
廠商: Electronic Theatre Controls, Inc.
英文描述: 8 BIT Integrated Microcontroller with 256K Bytes ROM
中文描述: 8位微控制器集成256K字節(jié)ROM的
文件頁數(shù): 25/65頁
文件大?。?/td> 1946K
代理商: ST2202
Sitronix
12.1.2 PRES
The prescaler PRES is an 8-bits counter as shown in FIGURE
12-1. Which provides four clock sources for base timer and
timer1, and it is controlled by register PRS. The instruction read
toward PRS will bring out the content of PRES and the
ST2202
Ver 2.0a
25/65
2003-May-05
Instruction write toward PRS will reset, enable or select clock
sources for PRES.
When user set external interrupt as the input of PRES for event
counter, combining PRES and Timer1 will get a 16bit-event
counter.
TABLE 12-2 Prescaler Control Register (PRS)
Bit 6
Bit 5
Bit 4
PRS[6]
PRS[5]
PRS[4]
SENA
SENT
-
Address Name
R/W
R
W
Bit 7
PRS[7]
SRES
Bit 3
PRS[3]
-
Bit 2
PRS[2]
-
Bit 1
PRS[1]
-
Bit 0
PRS[0]
-
Default
0000 0000
000 - - - - -
$023
PRS
READ
Bit 7~0:
PRS[7~0] :
Value of PRES counter
WRITE
Bit 7:
SRES :
Prescaler Reset bit
Write “1” to reset the prescaler (PRS[7~0])
Bit 6:
SENA :
Prescaler enable bit
0 = Disable prescaler counting
1 = Enable prescaler counting
Bit 5:
SENT :
Clock source(TCLK) selection for prescaller PRES
0 = Clock source from system clock “SYSCK”
1 = Clock source from external events “INTX”
12.1.3 PREW
The prescaler PREW is an 8-bits counter as shown in Figure
11-6. PREW provides four clocks source for base timer and
timer1. It stops counting only if OSCX stops or hardware reset
occurs.
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