參數(shù)資料
型號： PSD4235G3-A-15JI
廠商： 意法半導(dǎo)體
英文描述： CAP 0.68UF 20V 10% TANT SMD-3216-18 TR-13-PL GOLD
中文描述： Flash在系統(tǒng)可編程外設(shè)的16位微控制器
文件頁數(shù)： 64/89頁
文件大?。?/td> 703K
代理商： PSD4235G3-A-15JI
PSD4235G2
64/89
JTAG Extensions.
TSTAT and TERR are two
JTAG extension signals enabled by a JTAG com-
mand received over the four standard JTAG pins
(TMS, TCK, TDI, and TDO). They are used to
speed Program and Erase cycles by indicating
status on PSD pins instead of having to scan the
status out serially using the standard JTAG chan-
nel. See Application Note AN1153.
TERR indicates if an error has occurred when
erasing a sector or programming in Flash memory.
This signal goes Low (active) when an Error con-
dition occurs, and stays Low until a specific JTAG
command is executed or a Reset (RESET) pulse
is received after an “ISC_DISABLE” command.
TSTAT behaves the same as Ready/Busy (PE4)
described in the section entitled “Ready/Busy
(PE4)”, on page 21. TSTAT is High when the
PSD4235G2 device is in Read mode (primary
Flash memory and secondary Flash memory con-
tents can be read). TSTAT is Low when Flash
memory Program or Erase cycles are in progress,
and also when data is being written to the second-
ary Flash memory .
TSTAT and TERR can be configured as open-
drain type signals with a JTAG command.
Note: The state of Reset (Reset) does not interrupt
(or prevent) JTAG operations if the JTAG signals
are dedicated by an NVM Configuration bit (via
PSDsoft Express). However, Reset (Reset) pre-
vents or interrupts JTAG operations if the JTAG
Enable Register (as shown in Table 21) is used to
enable the JTAG signals.
Security and Flash memory Protection.
When
the security bit is set, the device cannot be read on
a Device Programmer or through the JTAG Port.
When using the JTAG Port, only a Full Chip Erase
command is allowed.
All other Program, Erase and Verify commands
are blocked. Full Chip Erase returns the device to
a non-secured blank state. The Security Bit can be
set in PSDsoft Express.
All primary Flash memory and secondary Flash
memory sectors can individually be sector protect-
ed against erasure. The sector protect bits can be
set in PSDsoft Express.
INITIAL DELIVERY STATE
When delivered from ST, the PSD device has all
bits in the memory and PLDs set to 1. The PSD
Configuration Register bits are set to 0. The code,
configuration, and PLD logic are loaded using the
programming procedure. Information for program-
ming the device is available directly from ST.
Please contact your local sales representative.
PE4
TSTAT
Status
PE5
TERR
Error Flag
Port E Pin
JTAG Signals
Description
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