參數(shù)資料
型號(hào): MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 10/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 97
Section 8: TIMER SYSTEM
MOTOROLA
MC68HC05G3 (705G4) Specification Rev. 1.1
8.5.5
TIMER BASE CONTROL REGISTER 1 (TBCR1)
READ:
anytime
WRITE:
anytime (only one-time write is allowed on bit 7 after reset)
TBCLK
Time Base Clock
The TBCLK bit selects time base clock source. This bit is cleared at reset. After
reset, write to this bit is allowed only once.
0 - XOSC clock is selected
1 - OSC clock divided by 128 is selected
BITS 6-4
Reserved
These bits are not used and always read as 0.
T3R1/0
Prescale Rate and Clock Select Bits for PWM
The T3R1 and T3R0 bits select the prescale rate of CLK3 or CMP2 from timer 2
for the PWM. These bits are cleared by reset.
NOTE:
While bits T3R1 and T3R0 may be written any time, if the selection is
changed while a PWM signal is being generated, a truncated or stretched
pulse may occur during the transition.
TBCLK
$0010
0
T3R1
T3R0
T2R1
T2R0
TBCR1
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
T3R1
T3R0
0
1
0
1
0
1
E
E/2
E/8
TIMCLK*/N (N=1....256)
PWM CLOCK
(CLK3)
(CMP2)
* TIMCLK = CLK2 or EXCLK
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