AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 343

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Programming Enable Register
Programming Command
Register
4250C–CAN–03/04
period (refer to “Clock Sources” on page 36) after releasing the Reset Register. The out-
put from this data register is not latched, so the reset will take place immediately, as
shown in Figure 141 on page 290.
The Programming Enable Register is a 16-bit register. The contents of this register is
c o m p a r e d
0b1010_0011_0111_0000. When the contents of the register is equal to the program-
ming enable signature, programming via the JTAG port is enabled. The register is reset
to 0 on Power-on Reset, and should always be reset when leaving Programming mode.
Figure 162. Programming Enable Register
The Programming Command Register is a 15-bit register. This register is used to seri-
ally shift in programming commands, and to serially shift out the result of the previous
command, if any. The JTAG Programming Instruction Set is shown in Table 135. The
state sequence when shifting in the programming commands is illustrated in Figure 164.
TDO
t o
TDI
D
A
A
T
t h e
0xA370
p r o g r a m m i n g
=
ClockDR & PROG_ENABLE
D
e n a b l e
Q
s i g n a t u r e ,
Programming Enable
AT90CAN128
b i n a r y
c o d e
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