参数资料
型号: PIC16C765-I/P
厂商: Microchip Technology
文件页数: 3/165页
文件大小: 0K
描述: IC MCU OTP 8KX14 USB 40DIP
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 10
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 24MHz
连通性: SCI,UART/USART,USB
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 33
程序存储器容量: 14KB(8K x 14)
程序存储器类型: OTP
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 4.35 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
产品目录页面: 636 (CN2011-ZH PDF)
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
其它名称: Q975613
PIC16C745/765
DS41124C-page 100
Preliminary
2000 Microchip Technology Inc.
13.2
Oscillator Configurations
13.2.1
OSCILLATOR TYPES
The PIC16C745/765 can be operated in four different
oscillator modes. The user can program a configuration
bit (FOSC0) to select one of these four modes:
EC External Clock
E4 External Clock with internal PLL enabled
HS High Speed Crystal/Resonator
H4 High Speed Crystal/Resonator with
internal PLL enabled
13.2.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In HS mode, a crystal or ceramic resonator is con-
nected to the OSC1/CLKIN and OSC2/CLKOUT pins to
establish oscillation (Figure 13-1). The PIC16C745/
765 oscillator design requires the use of a parallel cut
crystal. Use of a series cut crystal may give a frequency
out of the crystal manufacturers specifications. When in
HS mode, the device can have an external clock
source to drive the OSC1/CLKIN pin (Figure 13-2). In
this mode, the oscillator start-up timer is active for a
period of 1024*TOSC. See the PICmicro Mid-Range
MCU Reference Manual (DS33023) for details on
building an external oscillator.
FIGURE 13-1: CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS OSC CONFIGURATION)
TABLE 13-1:
CERAMIC RESONATORS
TABLE 13-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
13.2.3
H4 MODE
In H4 mode, a PLL module is switched on in-line with
the clock provided across OSC1 and OCS2. The output
of the PLL drives FINT.
13.2.4
PLL
An on-board 4x PLL provides a cheap means of gener-
ating a stable 24 MHz FINT, using an external 6 MHz
resonator. After power-up, a PLL settling time of less
than TPLLRT is required.
C1
C2
XTAL
OSC2
Note1
OSC1
Rf
SLEEP
To internal
logic
PIC16C745/765
Rs
Note 1:
A series resistor may be required for AT strip cut
crystals.
Ranges Tested:
Mode
Freq
OSC1
OSC2
HS
6.0 MHz
10 - 68 pF
These values are for design guidance only. See notes at
bottom of page.
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
HS
6.0 MHz
15 - 33 pF
These values are for design guidance only. See notes at
bottom of page.
Note 1: Higher capacitance increases the stability
of the oscillator, but also increases the start-
up time.
2: Since each resonator/crystal has its own
characteristics, the user should consult the
resonator/crystal manufacturer for appropri-
ate values of external components.
3: Rs may be required in HS mode to avoid
overdriving crystals with low drive level
specification.
4: When migrating from other PICmicro
devices, oscillator performance should be
verified.
5: Users should consult the USB Specification
1.1 to ensure their resonator/crystal oscilla-
tor meets the required jitter limits for USB
operation.
745cov.book Page 100 Wednesday, August 2, 2000 8:24 AM
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