Dataman 448PRO2 User Manual page 162

DATAMAN recommended circuit for AT89Sxxx:
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PICmicro microcontrollers
This interface corresponds with Microchip application notes TB013, TB017, TB016: How to
TM
Implement ICSP
These application notes describes requirement for target system with In-system programming
device and ISP programmer.
Following signals are use for In-system programming of PICmicro
MCLR\ / VPP reset / switch to programming mode
RB6 (GP1) clock
RB7 (GP0) data input / output
VDD power supply
GND ground
®
When PICmicro device is programmed; pin MCLR\ / VPP is driven to approximately 12 V.
Therefore, the target system must be isolated from this voltage provided by programmer.
RB6 and RB7 signals are used by the PICmicro
system mustn't affect these signals during In-system programming to avoid programming
errors.
Marginal verify is used after programming. Programmer must verify the program memory
contents at both minimal and maximal power supply, therefore VDD pin of PICmicro
isolated from rest of target system during programming.
ISP connector
DATA IN
DATA OUT
SCK
RST
target VCC check only
GND
C2
1u/10V
D2
1N4148
R11
100k
GND GND
reset circuit
Using PIC16CXXX OTP (PIC12C5XX OTP) (PIC16F8X Flash) MCUs.
target device
C1
22n
GND
VCC
MOSI
MISO
RST SCK
I1
AT89Sxxx
GND
GND
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for In-system programming; therefore target
162
target system
VCC
R1
R2
R3
GND
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microcontrollers.
®
must be