参数资料
型号: PIC16C432-I/P
厂商: Microchip Technology
文件页数: 39/70页
文件大小: 0K
描述: IC MCU CMOS 8-BIT 20MHZ 2K 20DIP
标准包装: 25
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: LIN(本地互连网络)
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 12
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 20-DIP(0.300",7.62mm)
包装: 管件
配用: AC164029-ND - MODULE SKT PROMATEII 20DIP/SSOP
DVA16XP201-ND - ADAPTER DEVICE FOR MPLAB-ICE
PIC16C432
DS41140B-page 42
Preliminary
2002 Microchip Technology Inc.
EXAMPLE 8-1:
VOLTAGE REFERENCE
CONFIGURATION
8.2
Voltage Reference Accuracy/Error
The full range of VSS to VDD cannot be realized due to
the construction of the module. The transistors on the
top and bottom of the resistor ladder network (Figure 8-
1) keep VREF from approaching VSS or VDD. The Volt-
age Reference is VDD derived and therefore, the VREF
output changes with fluctuations in VDD. The absolute
accuracy of the Voltage Reference can be found in
8.3
Operation During SLEEP
When the device wakes up from SLEEP through an
interrupt or a Watchdog Timer timeout, the contents of
the VRCON register are not affected. To minimize
current consumption in SLEEP mode, the Voltage
Reference should be disabled.
8.4
Effects of a RESET
A device RESET disables the Voltage Reference by
clearing bit VREN (VRCON<7>). This RESET also
disconnects the reference from the RA2 pin by clearing
bit VROE (VRCON<6>) and selects the high voltage
range by clearing bit VRR (VRCON<5>). The VREF
value select bits, VRCON<3:0>, are also cleared.
8.5
Connection Considerations
The
Voltage
Reference
Module
operates
independently of the comparator module. The output of
the reference generator may be connected to the RA2
pin if the TRISA<2> bit is set and the VROE bit,
VRCON<6>, is set. Enabling the Voltage Reference
output onto the RA2 pin, with an input signal present,
will increase current consumption. Connecting RA2 as
a digital output with VREF enabled will also increase
current consumption.
The RA2 pin can be used as a simple D/A output with
limited drive capability. Due to the limited drive
capability, a buffer must be used in conjunction with the
Voltage Reference output for external connections to
VREF.
shows
an
example
buffering
technique.
FIGURE 8-2:
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
TABLE 8-2:
REGISTERS ASSOCIATED WITH VOLTAGE REFERENCE
MOVLW
0x02
; 4 Inputs Muxed
MOVWF
CMCON
; to 2 comps.
BSF
STATUS,RP0
; go to Bank 1
MOVLW
0x07
; RA3-RA0 are
MOVWF
TRISA
; outputs
MOVLW
0xA6
; enable VREF
MOVWF
VRCON
; low range
; set VR<3:0>=6
BCF
STATUS,RP0
; go to Bank 0
CALL
DELAY10
; 10
s delay
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value On
POR/BOD
Value On
All Other
RESETS
9Fh
VRCON
VREN
VROE
VRR
VR3
VR2
VR1
VR0
000- 0000
1Fh
CMCON
C2OUT
C1OUT
CIS
CM2
CM1
CM0
00-- 0000
85h
TRISA
TRISA4
TRISA3
TRISA2
TLINRX(1)
TRISA0
---1 1111
Legend:
— = Unimplemented, read as ‘0’
Note
1:
TLINRX must be set to ‘1’ at all times.
VREF Output
+
VREF
Module
Voltage
Reference
Output
Impedance
R(1)
RA2
Note 1:
R is dependent upon the Voltage Reference Configuration VRCON<3:0> and VRCON<5>.
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