参数资料
型号: PIC12C509/JW
厂商: Microchip Technology
文件页数: 53/113页
文件大小: 0K
描述: IC MCU EPROM 1KX12 8CDIP
标准包装: 56
系列: PIC® 12C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 5
程序存储器容量: 1.5KB(1K x 12)
程序存储器类型: EPROM,UV
RAM 容量: 41 x 8
电压 - 电源 (Vcc/Vdd): 2.5 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 8-CDIP(0.300",7.62mm)窗口
包装: 管件
配用: DVMCPA-ND - KIT DVR BOARD EVAL SYSTEM MXDEV1
DVA12XP080-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
PIC12C5XX
DS40139E-page 44
1999 Microchip Technology Inc.
8.7
Time-Out Sequence, Power Down,
and Wake-up from SLEEP Status Bits
(TO/PD/GPWUF)
The TO, PD, and GPWUF bits in the STATUS register
can be tested to determine if a RESET condition has
been caused by a power-up condition, a MCLR or
Watchdog Timer (WDT) reset.
8.8
Reset on Brown-Out
A brown-out is a condition where device power (VDD)
dips below its minimum value, but not to zero, and then
recovers. The device should be reset in the event of a
brown-out.
To reset PIC12C5XX devices when a brown-out
occurs, external brown-out protection circuits may be
built, as shown in Figure 8-13 , Figure 8-14 and
FIGURE 8-13: BROWN-OUT PROTECTION
CIRCUIT 1
TABLE 8-7:
TO/PD/GPWUF STATUS
AFTER RESET
GPWUF
TO
PD
RESET caused by
0
WDT wake-up from
SLEEP
0
u
WDT time-out (not from
SLEEP)
01
0
MCLR wake-up from
SLEEP
01
1
Power-up
0u
u
MCLR not during SLEEP
1
0
Wake-up from SLEEP on
pin change
Legend: u = unchanged
Note 1: The TO, PD, and GPWUF bits maintain
their status (u) until a reset occurs. A low-
pulse on the MCLR input does not change
the TO, PD, and GPWUF status bits.
This circuit will activate reset when VDD goes below
Vz + 0.7V (where Vz = Zener voltage).
*Refer to Figure 8-7 and Table 11-1 for internal
weak pull-up on MCLR.
33k
10k
40k*
MCLR
PIC12C5XX
VDD
Q1
VDD
FIGURE 8-14: BROWN-OUT PROTECTION
CIRCUIT 2
FIGURE 8-15: BROWN-OUT PROTECTION
CIRCUIT 3
This brown-out circuit is less expensive, although
less accurate. Transistor Q1 turns off when VDD
is below a certain level such that:
*Refer to Figure 8-7 and Table 11-1 for internal
weak pull-up on MCLR.
VDD
R1
R1 + R2
= 0.7V
R2
40k*
MCLR
PIC12C5XX
R1
Q1
VDD
This
brown-out
protection
circuit
employs
Microchip Technology’s MCP809 microcontroller
supervisor. The MCP8XX and MCP1XX family of
supervisors provide push-pull and open collector
outputs with both high and low active reset pins.
There are 7 different trip point selections to
accomodate 5V and 3V systems.
MCLR
PIC12C5XX
VDD
Vss
RST
MCP809
VDD
bypass
capacitor
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