参数资料
型号: ST72F32AK2TB
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
封装: 7 X 7 MM, PLASTIC, TQFP-32
文件页数: 63/157页
文件大小: 1516K
代理商: ST72F32AK2TB
ST7232A
155/157
DEVICE CONFIGURATION AND ORDERING INFORMATION (Cont’d)
tion is not doing anything between the idle and the
break. This can be ensured by temporarily disa-
bling interrupts.
The exact sequence is:
- Disable interrupts
- Reset and Set TE (IDLE request)
- Set and Reset SBK (Break Request)
- Re-enable interrupts
15.1.6 39-Pulse ICC Entry Mode
For Flash devices, ICC mode entry using ST7 ap-
plication clock (39 pulses) is not supported. Exter-
nal clock mode must be used (36 pulses). Refer to
the ST7 Flash Programming Reference Manual.
15.2 ROM DEVICES ONLY
15.2.1 I/O Port A and F Configuration
When using an external quartz crystal or ceramic
resonator, a few fOSC2 clock periods may be lost
when the signal pattern in Table 31 occurs . This is
because this pattern causes the device to enter
test mode and return to user mode after a few
clock periods. User program execution and I/O
status are not changed, only a few clock cycles are
lost.
This happens with either one of the following con-
figurations:
PA3=0, PF4=1, PF1=0 while PLL option is disa-
bled and PF0 is toggling
PA3=0, PF4=1, PF1=0, PF0=1 while PLL option is
enabled
This is detailed in the following table
Table 31. Port A and F Configuration:
As a consequence, for cycle-accurate operations,
these configurations are prohibited in either input
or output mode.
Workaround:
To avoid this occurring, it is recommended to con-
nect one of these pins to GND (PF4 or PF0) or
VDD (PA3 or PF1).
15.2.2 External clock source with PLL
PLL is not supported with external clock source.
PLL PA3 PF4 PF1
PF0
Clock
Disturbance
OFF
010
Toggling
Max. 2 clock cy-
cles lost at each
rising or falling
edge of PF0
ON
010
1
Max. 1 clock cy-
cle lost out of
every 16
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