ATMEGA64M1-15MZ Atmel, ATMEGA64M1-15MZ Datasheet - Page 280
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ATMEGA64M1-15MZ
Manufacturer Part Number
ATMEGA64M1-15MZ
Description
MCU AVR 64KB FLASH 3PSC 32-VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA64M1-15MZ.pdf
(367 pages)
Specifications of ATMEGA64M1-15MZ
Package / Case
32-VQFN
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Speed
16MHz
Eeprom Size
2K x 8
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
4K x 8
Program Memory Size
64KB (64K x 8)
Data Converters
A/D 11x10b; D/A 1x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Connectivity
CAN, LIN, SPI, UART/USART
Core Size
8-Bit
Processor Series
ATMEGA64x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
4 KB
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATADAPCAN01
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of I /o
-
Lead Free Status / Rohs Status
Details
- Current page: 280 of 367
- Download datasheet (7Mb)
24.3
24.3.1
24.3.2
280
Read-While-Write and No Read-While-Write Flash Sections
Atmel ATmega16/32/64/M1/C1
RWW – Read-While-Write Section
NRWW – No Read-While-Write Section
Whether the CPU supports Read-While-Write or if the CPU is halted during a Boot Loader
software update is dependent on which address that is being programmed. In addition to the
two sections that are configurable by the BOOTSZ Fuses as described above, the Flash is
also divided into two fixed sections, the Read-While-Write (RWW) section and the No
Read-While-Write (NRWW) section. The limit between the RWW- and NRWW sections is
given in
the two sections is:
Note that the user software can never read any code that is located inside the RWW section
during a Boot Loader software operation. The syntax “Read-While-Write section” refers to
which section that is being programmed (erased or written), not which section that actually is
being read during a Boot Loader software update.
If a Boot Loader software update is programming a page inside the RWW section, it is possi-
ble to read code from the Flash, but only code that is located in the NRWW section. During an
on-going programming, the software must ensure that the RWW section never is being read. If
the user software is trying to read code that is located inside the RWW section (i.e., by a
call/jmp/lpm or an interrupt) during programming, the software might end up in an unknown
state. To avoid this, the interrupts should either be disabled or moved to the Boot Loader sec-
tion. The Boot Loader section is always located in the NRWW section. The RWW Section
Busy bit (RWWSB) in the Store Program Memory Control and Status Register (SPMCSR) will
be read as logical one as long as the RWW section is blocked for reading. After a program-
ming is completed, the RWWSB must be cleared by software before reading code located in
the RWW section.
page 284.
The code located in the NRWW section can be read when the Boot Loader software is updat-
ing a page in the RWW section. When the Boot Loader code updates the NRWW section, the
CPU is halted during the entire Page Erase or Page Write operation.
Table 24-1.
• When erasing or writing a page located inside the RWW section, the NRWW section can
• When erasing or writing a page located inside the NRWW section, the CPU is halted during
Which Section does the Z-pointer
be read during the operation.
the entire operation.
Table 24-8 on page 292
Address During the
for details on how to clear RWWSB.
Programming?
NRWW Section
RWW Section
Read-While-Write Features
See “Store Program Memory Control and Status Register – SPMCSR” on
and
Figure 24-2 on page
Which Section Can
be Read During
Programming?
NRWW Section
None
282. The main difference between
Is the CPU
Halted?
Yes
No
Read-While-Write
Supported?
7647G–AVR–09/11
Yes
No
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