参数资料
型号: PIC18F8722T-I/PT
厂商: Microchip Technology
文件页数: 14/16页
文件大小: 0K
描述: IC PIC MCU FLASH 64KX16 80TQFP
产品培训模块: Asynchronous Stimulus
PIC18 J Series MCU Overview
标准包装: 1,200
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 70
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 1K x 8
RAM 容量: 3.8K x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 16x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 80-TQFP
包装: 带卷 (TR)
配用: DV164136-ND - DEVELOPMENT KIT FOR PIC18
XLT80PT3-ND - SOCKET TRAN ICE 80MQFP/TQFP
AC164320-ND - MODULE SKT MPLAB PM3 80TQFP
AC174011-ND - MODULE SKT PROMATEII 80TQFP
2006 Microchip Technology Inc.
DS80221C-page 7
PIC18F6627/6722/8627/8722
21. Module: MSSP (SPI Mode)
When the SPI is using Timer2/2 as the clock
source, a shorter than expected SCKx pulse may
occur on the first bit of the transmitted/received
data (Figure 1).
FIGURE 1:
SCKx PULSE VARIATION
USING TIMER2/2
Work around
To avoid producing the short pulse, turn off Timer2
and clear the TMR2 register, load the SSPxBUF
with the data to transmit and then turn Timer2 back
on. Refer to Example 4 for sample code.
EXAMPLE 4:
AVOIDING THE INITIAL
SHORT SCK PULSE
22. Module: Timer1
In 16-bit Asynchronous Counter mode or 16-bit
Asynchronous Oscillator mode, the TMR1H and
TMR3H buffers do not update when TMRxL is
read. This issue only affects reading the TMRxH
registers. The timers increment and set the inter-
rupt flags as expected. The Timer registers can
also be written as expected.
Work around
Use 8-bit mode by clearing the RD16 (T1CON<7>)
bit or use the synchronization option by clearing
T1SYNC (T1CON<2>).
23. Module: PORTE
The RE4 pin latch remains at a logic level zero
when the ECCPMX Configuration bit is clear and
selects PORTH.
Work around
This issue will be corrected in a future revision of
silicon.
SDOx
SCKx
Write SSPxBUF
bit 0 = 1 bit 1 = 0
bit 2 = 1 . . . .
LOOP BTFSS SSPSTAT, BF
;Data received?
;(Xmit complete?)
BRA
LOOP
;No
MOVF
SSPBUF, W
;W = SSPBUF
MOVWF
RXDATA
;Save in user RAM
MOVF
TXDATA, W
;W = TXDATA
BCF
T2CON, TMR2ON
;Timer2 off
CLRF
TMR2
;Clear Timer2
MOVWF
SSPBUF
;Xmit New data
BSF
T2CON, TMR2ON
;Timer2 on
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