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参数资料
型号： ST72F324K2B6
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, PDIP32
封装： 0.400 INCH, PLASTIC, SDIP-32
文件页数： 66/156页
文件大小： 1027K
代理商： ST72F324K2B6
ST72324J/K
17/156
FLASH PROGRAM MEMORY (Cont’d)
4.4 ICC Interface
ICC needs a minimum of 4 and up to 6 pins to be
connected to the programming tool (see Figure 7).
These pins are:
– RESET: device reset
–VSS: device power supply ground
– ICCCLK: ICC output serial clock pin
– ICCDATA: ICC input/output serial data pin
– ICCSEL/VPP: programming voltage
– OSC1(or OSCIN): main clock input for exter-
nal source (optional)
–VDD: application board power supply (option-
al, see Figure 7, Note 3)
Figure 7. Typical ICC Interface
Notes:
1. If the ICCCLK or ICCDATA pins are only used
as outputs in the application, no signal isolation is
necessary. As soon as the Programming Tool is
plugged to the board, even if an ICC session is not
in progress, the ICCCLK and ICCDATA pins are
not available for the application. If they are used as
inputs by the application, isolation such as a serial
resistor has to implemented in case another de-
vice forces the signal. Refer to the Programming
Tool documentation for recommended resistor val-
ues.
2. During the ICC session, the programming tool
must control the RESET pin. This can lead to con-
flicts between the programming tool and the appli-
cation reset circuit if it drives more than 5mA at
high level (push pull output or pull-up resistor<1K).
A schottky diode can be used to isolate the appli-
cation RESET circuit in this case. When using a
classical RC network with R>1K or a reset man-
agement IC with open drain output and pull-up re-
sistor>1K, no additional components are needed.
In all cases the user must ensure that no external
reset is generated by the application during the
ICC session.
3. The use of Pin 7 of the ICC connector depends
on the Programming Tool architecture. This pin
must be connected when using most ST Program-
ming Tools (it is used to monitor the application
power supply). Please refer to the Programming
Tool manual.
4. Pin 9 has to be connected to the OSC1 or OS-
CIN pin of the ST7 when the clock is not available
in the application or if the selected clock option is
not programmed in the option byte. ST7 devices
with multi-oscillator capability need to have OSC2
grounded in this case.
5. In the application, when the RESET pin is low,
the ICCCLK pin must always be in pull-up or high
impedance state. For instance, it must never be
forced to ground or connected to an external pull-
down. This is to avoid entering ICC mode unex-
pectedly during normal application operation.
ICC CONNECTOR
ICCDATA
ICCCLK
RESET
V
DD
HE10 CONNECTOR TYPE
APPLICATI ON
POWER SUPPLY
1
2
4
6
8
10
97
5
3
PROGRAMMING TOOL
ICC CONNECTOR
APPLI CATION BOARD
ICC Cable
OPTIONAL
(See Note 3)
10k
V
SS
ICCSEL/VPP
ST7
CL2
CL1
OSC1
OSC2
OPTION AL
See Note 1
See Notes 1 and 5
See Note 2
APPLICATION
RESET SOURCE
APPLICA TION
I/O
(See Note 4)
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