参数资料
型号: MC705JJ7CDWE
厂商: Freescale Semiconductor
文件页数: 10/164页
文件大小: 0K
描述: IC MCU 8BIT 224B RAM 20-SOIC
标准包装: 38
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SIO
外围设备: POR,温度传感器,WDT
输入/输出数: 14
程序存储器容量: 6KB(6K x 8)
程序存储器类型: OTP
RAM 容量: 224 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 4x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
包装: 管件
Timer Registers
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
107
11.2 Timer Registers
The functional block diagram of the 16-bit free-running timer counter and timer registers is shown in
Figure 11-2. The timer registers include a transparent buffer latch on the LSB of the 16-bit timer counter.
Figure 11-2. Programmable Timer Block Diagram
The timer registers (TMRH and TMRL) shown in Figure 11-3 are read-only locations which contain the
current high and low bytes of the 16-bit free-running counter. Writing to the timer registers has no effect.
Reset of the device presets the timer counter to $FFFC.
The TMRL latch is a transparent read of the LSB until a read of the TMRH takes place. A read of the
TMRH latches the LSB into the TMRL location until the TMRL is again read. The latched value remains
fixed even if multiple reads of the TMRH take place before the next read of the TMRL. Therefore, when
reading the MSB of the timer at TMRH, the LSB of the timer at TMRL must also be read to complete the
read sequence.
During power-on reset (POR), the counter is initialized to $FFFC and begins counting after the oscillator
startup delay. Because the counter is 16 bits and preceded by a fixed prescaler, the value in the counter
repeats every 262,144 internal bus clock cycles (524,288 oscillator cycles).
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
11111111
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 7
654321
Bit 0
Write:
Reset:
11111100
= Unimplemented
Figure 11-3. Programmable Timer Registers (TMRH and TMRL)
TO
IE
TMRH ($0018)
TMR LSB
16-BIT COUNTER
÷ 4
INTERNAL
(OSC
÷ 2)
TIMER CONTROL REG.
TIMER
REQUEST
OVERFLOW (TOF)
RESET
CLOCK
INTERRUPT
TMRL ($0019)
TO
F
TIMER STATUS REG.
$0012
$0013
INTERNAL
$FFFC
DATA
READ
TMRH
READ
TMRL
READ
LATCH
BUS
相关PDF资料
PDF描述
VI-B1H-IY-F4 CONVERTER MOD DC/DC 52V 50W
VE-B43-IX-B1 CONVERTER MOD DC/DC 24V 75W
AD724JRZ-RL IC ENCODER RGB TO NTSC 16SOIC TR
VE-B42-IX-B1 CONVERTER MOD DC/DC 15V 75W
VI-B1F-IY-F3 CONVERTER MOD DC/DC 72V 50W
相关代理商/技术参数
参数描述
MC705JJ7CDWE 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MC705JP7CPE 功能描述:8位微控制器 -MCU 8B MCU 224 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
MC705JP7CPE 制造商:Freescale Semiconductor 功能描述:IC 8BIT MCU 68HC05 2.1MHZ DIP-28
MC705K1CP 制造商:Motorola Inc 功能描述:16 PIN DIP INTEGRATED CIRCUIT
MC705L16CFUE 功能描述:8位微控制器 -MCU 8B MCU W/ EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT