參數(shù)資料
型號: MC68HC05SB7
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: MO-150, SSOP-28
文件頁數(shù): 21/170頁
文件大?。?/td> 2161K
代理商: MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
ANALOG SUBSYSTEM
MOTOROLA
REV 2.1
15-19
15.4
A/D CONVERSION METHODS
The control bits in the ACR provide various options to charge or discharge current
through the CAP pin in order to perform single-slope A/D conversions using an
external capacitor from the CAP pin to VSS as shown in Figure 15-7. The various
A/D conversion triggering options are given in Table 15-3.
Figure 15-7. Single-Slope A/D Conversion Method
The top three bits of the ACR control the charging and discharging current into or
out of the CAP pin. These three bits will have no affect on the CAP pin if the ISEN
enable bit is cleared. Any clearing of the ISEN bit will immediately disable both the
UNKNOWN VOLTAGE ON (–) INPUT
CHARGE TIME
TO MATCH UNKNOWN
DISCHARGE TIME
TO RESET CAPACITOR
VOLTAGE ON
CAPACITOR
CONNECTED
TO (+) INPUT
MAXIMUM CHARGE TIME
TO VDD – 1.5 VDC
VDD – 1.5 VDC
Charge Time = C x VX
I
VDD
+5V
RAMP
CAP
VSS
CAP
PB4/AN3
PB5/AN2
PB6/AN1
PB7/AN0
UNKNOWN
SIGNALS
MC68HC05SB7
VDD
+5V
RAMP
CAP
VSS
CAP
PB4/AN3
PB5/AN2
PB6/AN1
PB7/AN0
UNKNOWN
SIGNALS
MC68HC05SB7
REFERENCE
VOLTAGE
TM
Using an
External Voltage
Reference
Using VDD
as Voltage
Reference
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