參數(shù)資料
型號(hào)： pic16c621a
廠商： Microchip Technology Inc.
英文描述： EPROM-Based 8-Bit CMOS Microcontroller(8位CMOS微控制器)
中文描述： 存儲(chǔ)器為基礎(chǔ)的8位CMOS微控制器（8位的CMOS微控制器）
文件頁數(shù)： 44/112頁
文件大?。?/td> 1205K
代理商： PIC16C621A
PIC16C62X(A)
DS30235F-page 44
Preliminary
1997 Microchip Technology Inc.
EXAMPLE 8-1:
VOLTAGE REFERENCE
CONFIGURATION
8.2
Voltage Reference Accuracy/Error
The full range of V
SS
to V
DD
cannot be realized due to
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 8-2) keep V
REF
from approaching V
SS
or V
DD
.
The Voltage Reference is V
DD
derived and therefore,
the V
REF
output changes with fluctuations in V
DD
. The
absolute accuracy of the Voltage Reference can be
found in Table 12-3.
8.3
Operation During Sleep
When the device wakes up from sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the VRCON register are not affected. To minimize
current consumption in SLEEP mode, the Voltage
Reference should be disabled.
MOVLW
MOVWF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
0x02
CMCON
STATUS,RP0
0x07
TRISA
0xA6
VRCON
; 4 Inputs Muxed
; to 2 comps.
; go to Bank 1
; RA3-RA0 are
; outputs
; enable V
REF
; low range
; set V
R
<3:0>=6
; go to Bank 0
; 10
μ
s delay
BCF
CALL
STATUS,RP0
DELAY10
8.4
Effects of a Reset
A device reset disables the Voltage Reference by clear-
ing bit V
REN
(VRCON<7>). This reset also disconnects
the reference from the RA2 pin by clearing bit V
ROE
(VRCON<6>) and selects the high voltage range by
clearing bit V
RR
(VRCON<5>). The V
REF
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 V
ROE
bit, VRCON<6>, is
set. Enabling the Voltage Reference output onto the
RA2 pin with an input signal present will increase cur-
rent consumption. Connecting RA2 as a digital output
with V
REF
enabled will also increase current consump-
tion.
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
V
REF
. Figure 8-3 shows an example buffering
technique.
FIGURE 8-3:
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
TABLE 8-1:
REGISTERS ASSOCIATED WITH VOLTAGE REFERENCE
Note:
- = Unimplemented, read as "0"
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value On
POR / BOR
Value On
All Other
Resets
9Fh
VRCON
VREN
VROE
VRR
—
VR3
VR2
VR1
VR0
000- 0000
000- 0000
1Fh
CMCON
C2OUT
C1OUT
—
—
CIS
CM2
CM1
CM0
00-- 0000
00-- 0000
85h
TRISA
—
—
—
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
---1 1111
---1 1111
V
REF
Output
+
–
V
REF
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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PIC16C621A-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C621 DIP18
PIC16C621A-04/SO 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C621A-04/SS 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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