ST7232AJ2 STMicroelectronics, ST7232AJ2 Datasheet - Page 18

• Manufacturer Part Number: ST7232AJ2
• Description: 8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST7232AJ2

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: Halt, Active-Halt, Wait and Slow
• Main Clock Controller With: Real time base, Beep and Clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST7232A
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
These pins are:
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
18/157
1
– RESET: device reset
– V
APPLICATION
POWER SUPPLY
SS
: device power supply ground
(See Note 3)
PROGRAMMING TOOL
C
L2
(See caution)
C
ST7
Figure
L1
7).
10kΩ
10
ICC CONNECTOR
9
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.
Caution: External clock ICC entry mode is man-
datory. Pin 9 must be connected to the OSC1 or
OSCIN pin of the ST7 and OSC2 must be ground-
ed.
7
8
– ICCCLK: ICC output serial clock pin
– ICCDATA: ICC input/output serial data pin
– ICCSEL/V
– OSC1(or OSCIN): main clock input for exter-
– V
nal source (optional)
al, see
5
6
DD
ICC Cable
: application board power supply (option-
4
3
Figure
1
2
PP
HE10 CONNECTOR TYPE
: programming voltage
7, Note 3)
ICC CONNECTOR
APPLICATION BOARD
APPLICATION
See Note 2
APPLICATION
RESET SOURCE
See Note 1
I/O