参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 29/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
ANALOG SUBSYSTEM
MC68HC05SB7
15-26
REV 2.1
Figure 15-11. A/D Conversion - OCF/ICF Control (Mode 3)
Point
Action
Software/Hardware Action
Dependent Variable(s)
0
Begin initial Discharge and select
Mode 3 by clearing CHG and set-
ting ATD2 and ATD1 in the ACR.
Software write.
(ICEN bit also set)
Software.
1
VCAP falls to VSS. Set Timer output
compare registers (OCRU, OCRL)
to desired charge start time.
Wait out minimum tDIS time.
Software write to OCRH, OCRL.
VMAX, IDIS, CX, Software.
2
Stop Discharge and begin Charge
when the next OCF sets the CHG
control bit in ACR.
Timer OCF sets the CHG control bit
in the ACR.
Free-running Timer
counter overflow, fOSC, P.
3
VCAP rises to VX and comparator
output trips, setting CPF which
causes an ICF from the Timer and
clears the CHG control bit in ACR.
Wait out tCHG time.
Timer ICF clears the CHG control
bit in the ACR.
VX, ICHG, CX.
tDIS
(MIN)
tCHG X ICHG
CX
tCHG
tDIS
VX =
VMAX
CHG
COMP
0
TOF
OCF
ICF
(MIN)
VCAP
tDIS
VX
1
2
3
1
3
(TCAP)
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