- 您现在的位置：买卖IC网 > PDF目录69028 > MC16S2CPU20B1 (FREESCALE SEMICONDUCTOR INC) 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100 PDF资料下载
参数资料
| 型号： | MC16S2CPU20B1 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 22/104页 |
| 文件大小： | 812K |
| 代理商： | MC16S2CPU20B1 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页当前第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页
MOTOROLA
MC68HC16S2
24
MC68HC16S2TS/D
PITM[7:0] — Periodic Interrupt Timer Modulus
This is an 8-bit timing modulus. The period of the timer can be calculated as follows:
where
PIT Period = Periodic interrupt timer period
PITM[7:0] = Periodic interrupt timer modulus
fref = Synthesizer reference of external clock input frequency
Prescaler = 1 if PTP = 0 or 512 if PTP = 1
3.5 External Bus Interface
The external bus interface (EBI) transfers information between the internal MCU bus and external de-
vices. The external bus has 24 address lines and 16 data lines. Because the CPU16 in the
MC68HC16S2 drives only 20 of the 24 IMB address lines, ADDR[23:20] follow the output state of
ADDR19.
The EBI provides dynamic sizing between 8-bit and 16-bit data accesses. It supports byte, word, and
long-word transfers. Ports are accessed through the use of asynchronous cycles controlled by the size
(SIZ1 and SIZ0) and data size acknowledge (DSACK1 and DSACK0) pins. Multiple bus cycles may be
required for dynamically sized transfer.
Port width is the maximum number of bits accepted or provided during a bus transfer. External devices
must follow the handshake protocol described below. Control signals indicate the beginning of the cycle,
the address space, the size of the transfer, and the type of cycle. The selected device controls the length
of the cycle. Strobe signals, one for the address bus and another for the data bus, indicate the validity
of an address and provide timing information for data. The EBI operates in an asynchronous mode for
any port width.
To add flexibility and minimize the necessity for external logic, MCU chip-select logic can be synchro-
nized with EBI transfers. Chip-select logic can also provide internally-generated bus control signals for
these accesses. Refer to 3.6 Chip-Selects for more information.
3.5.1 Bus Control Signals
The CPU initiates a bus cycle by driving the address, size, function code, and read/write outputs. At the
beginning of the cycle, size signals SIZ0 and SIZ1 are driven along with the function code signals
FC[2:0]. The size signals indicate the number of bytes remaining to be transferred during an operand
cycle. They are valid while the address strobe AS is asserted.
Table 13 shows SIZ0 and SIZ1 encoding. The read/write (R/W) signal determines the direction of the
transfer during a bus cycle. This signal changes state, when required, at the beginning of a bus cycle,
and is valid while AS is asserted. The R/W signal only changes state when a write cycle is preceded by
a read cycle or vice versa. The signal can remain low for two consecutive write cycles.
Table 13 Size Signal Encoding
SIZ1
SIZ0
Transfer Size
0
1
Byte
1
0
Word
1
Three byte
0
Long word
PIT Period
4 PITM[7:0]
() Prescaler
()
f
ref
-----------------------------------------------------------------
=
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC16X1CTH | 16-BIT, MROM, 16.78 MHz, MICROCONTROLLER, PQFP120 |
| MC68HC24VP | 16 I/O, PIA-GENERAL PURPOSE, PDIP40 |
| MC68HC33CFG | 48 I/O, PIA-GENERAL PURPOSE, PQFP100 |
| MC68HC33FG | 48 I/O, PIA-GENERAL PURPOSE, PQFP100 |
| MC68HC56FN | 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC16XSD200FK | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Dual 16 mOhm High Side Switch |
| MC16Z1CFC25B1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC16Z1CPV20B1 | 制造商:Rochester Electronics LLC 功能描述:16 BIT MCU, 1K RAM - Bulk |
| MC16Z3BCAG16 | 功能描述:16位微控制器 - MCU 16BIT MCU 4KRAM 8KROM RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| MC-17 | 功能描述:TERM BARRIER 17CIRC DUAL ROW RoHS:是 类别:连接器，互连式 >> 接线座 - 隔板块 系列:M 标准包装:10 系列:Beau™ 38780 端接块类型:阻隔块 电路数:15 导线入口数目:30 间距:0.438"（11.12mm） 行数:2 电流:15A 电压:300V 线规:14-22 AWG 顶部端子:螺钉 底部端子:焊片 阻挡层类型:双壁（双） 特点:法兰 颜色:黑 包装:散装 安装类型:通孔 工作温度:- 材料 - 绝缘体:聚对苯二甲酸丁二酯（PBT），玻璃纤维增强型 材料可燃性额定值:UL94 V-0 其它名称:038780-111538780-1115387801115 |
发布紧急采购，3分钟左右您将得到回复。