Rev. 3.0, 10/02, page 432 of 686
•
TRST
must be separated from the system circuitry in order not to affect the system
operation.
•
System circuitry must also be separated from the
TRST
in order not to affect
TRST
operation as shown in figure 14.4.
Board edge pin
System
reset
LSI
Power-on
reset circuit
Figure 14.4 Recommended Reset Signal Design
3. TCK clock speed must be within 16 MHz.
4. In serial communication, data is input or output from the LSB as shown in figure 14.5.
Boundary scan register
Bit n
Bit n-1
Bit 1
Bit 0
TDI
TDO
Figure 14.5 Serial Data Input/Output
5. If a pin with pull-up function is SAMPLEed with pull-up function enabled, the corresponding
IN register is set to 1. In this case, the corresponding Control register must be cleared to 0.
6. If a pin with open-drain function is SAMPLEed while its open-drain function is enabled and
while the corresponding OUT register is set to 1, the corresponding Control register is cleared
to 0 (the pin status is Hi-Z). If the pin is SAMPLEed while the corresponding OUT register is
cleared to 0, the corresponding Control register is set to 1 (the pin status is 0).
7. If EXTEST, CLAMP, or HIGHZ state is entered, this LSI enters guarded mode such as
hardware standby mode (
RES
=
STBY
= 0). Before entering normal operating mode from
EXTEST, CLAMP, or HIGHZ state, specify
RES
,
STBY
, FWE, and MD2 to MD0 pin to the
designated mode.
Содержание H8S/2215 Series
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Страница 481: ...Rev 3 0 10 02 page 423 of 686 I O pin Control OUT IN TDI pin TDO pin Figure 14 2 Boundary Scan Register Configuration ...
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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