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PIC16C65B-04/L 参数 Datasheet PDF下载

PIC16C65B-04/L图片预览
型号: PIC16C65B-04/L
PDF下载: 下载PDF文件 查看货源
内容描述: 40分之28引脚8位CMOS微控制器 [28/40-Pin 8-Bit CMOS Microcontrollers]
分类和应用: 微控制器和处理器外围集成电路PC可编程只读存储器时钟
文件页数/大小: 184 页 / 2121 K
品牌: MICROCHIP [ MICROCHIP TECHNOLOGY ]
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PIC16C63A/65B/73B/74B
13.3
RESET
The PIC16CXX differentiates between various kinds of
RESET:
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during SLEEP
WDT Reset (normal operation)
Brown-out Reset (BOR)
on MCLR Reset during SLEEP, and on BOR. The TO
and PD bits are set or cleared differently in different
RESET situations, as indicated in Table 13-4. These
bits are used in software to determine the nature of the
RESET. See Table 13-6 for a full description of RESET
states of all registers.
A simplified block diagram of the on-chip RESET circuit
is shown in Figure 13-4.
The PICmicro devices have a MCLR noise filter in the
MCLR Reset path. The filter will detect and ignore
small pulses.
It should be noted that internal RESET sources do not
drive MCLR pin low.
Some registers are not affected in any RESET condi-
tion; their status is unknown on POR and unchanged in
any other RESET. Most other registers are reset to a
“RESET state” on POR, on the MCLR and WDT Reset,
FIGURE 13-4:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
External
RESET
MCLR
WDT
Module
V
DD
Rise
Detect
V
DD
Brown-out
Reset
OST/PWRT
OST
SLEEP
WDT
Time-out
Reset
Power-on Reset
S
BODEN
10-bit Ripple Counter
OSC1
(Note 1)
PWRT
On-chip
10-bit Ripple Counter
RC OSC
Chip Reset
R
Q
Enable PWRT
Enable OST
Note 1:
This is a separate oscillator from the RC oscillator of the CLKIN pin.
DS30605C-page 88
2000 Microchip Technology Inc.