參數(shù)資料
型號: PIC16C745T-I/SO
廠商: Microchip Technology
文件頁數(shù): 4/165頁
文件大?。?/td> 0K
描述: IC MCU OTP 8KX14 USB A/D 28SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
標(biāo)準(zhǔn)包裝: 1,600
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 24MHz
連通性: SCI,UART/USART,USB
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: OTP
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 4.35 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
2000 Microchip Technology Inc.
Preliminary
DS41124C-page 101
PIC16C745/765
13.2.5
EXTERNAL CLOCK IN
In EC mode, users may directly drive the PIC16C745/
765 provided that this external clock source meets the
AC/DC timing requirements listed in Section 17.4.
Figure 13-2 below shows how an external clock circuit
should be configured.
FIGURE 13-2: EXTERNAL CLOCK INPUT
OPERATION (EC OSC
CONFIGURATION)
13.2.6
E4 MODE
In E4 mode, a PLL module is switched on in-line with
the clock provided to OSC1. The output of the PLL
drives FINT.
FIGURE 13-3: OSCILLATOR/PLL CLOCK CONTROL
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)
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,
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 13-7 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 a WDT Reset does not drive
MCLR pin low.
Clock from
ext. system
PIC16C745/765
OSC1
OSC2/CLKOUT
CLKOUT
Note: CLKOUT is the same frequency as OSC1 if
in E4 mode, otherwise CLKOUT = OSC1/4.
OSC2
OSC1
EC
E4
HS
H4
4x PLL
6 MHz
Q Clock
Generator
To Circuits
24 MHz
FINT
EC
E4
HS
H4
745cov.book Page 101 Wednesday, August 2, 2000 8:24 AM
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