参数资料
型号: ST72T121J2B3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, SHRINK, PLASTIC, DIP-42
文件页数: 35/93页
文件大小: 597K
代理商: ST72T121J2B3
40/93
ST72E121 ST72T121
16-BIT TIMER (Cont’d)
Notes:
1. After a processor write cycle to the OC
iHR reg-
ister, the output compare function is inhibited
until the OC
iLR register is also written.
2. If the OC
iE bit is not set, the OCMPi pin is a
general I/O port and the OLVL
i bit will not
appear when a match is found but an interrupt
could be generated if the OCIE bit is set.
3. When the timer clock is fCPU/2, OCFi and
OCMP
i are set while the counter value equals
the OC
iR register value (see Figure 28, on
page 41). This behaviour is the same in OPM
or PWM mode.
When the timer clock is fCPU/4, fCPU/8 or in
external clock mode, OCF
i and OCMPi are set
while the counter value equals the OC
iR regis-
ter value plus 1 (see Figure 29, on page 41).
4. The output compare functions can be used both
for generating external events on the OCMP
i
pins even if the input capture mode is also
used.
5. The value in the 16-bit OCiR register and the
OLV
i bit should be changed after each suc-
cessful comparison in order to control an output
waveform or establish a new elapsed timeout.
Forced Compare Output capability
When the FOLV
i bit is set by software, the OLVLi
bit is copied to the OCMP
i pin. The OLVi bit has to
be toggled in order to toggle the OCMP
i pin when
it is enabled (OC
iE bit=1). The OCFi bit is then not
set by hardware, and thus no interrupt request is
generated.
FOLVL
i bits have no effect in either One-Pulse
mode or PWM mode.
Figure 27. Output Compare Block Diagram
OUTPUT COMPARE
16-bit
CIRCUIT
OC1R Register
16 BIT FREE RUNNING
COUNTER
OC1E
CC0
CC1
OC2E
OLVL1
OLVL2
OCIE
(Control Register 1) CR1
(Control Register 2) CR2
0
OCF2
OCF1
(Status Register) SR
16-bit
OCMP1
OCMP2
Latch
1
Latch
2
OC2R Register
Pin
FOLV2 FOLV1
40
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ST72T121J2T6S 制造商:STMicroelectronics 功能描述:
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ST72T121J4T6 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI/SC 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