ATMEGA32HVB-8X3 Atmel, ATMEGA32HVB-8X3 Datasheet - Page 192
![MCU AVR 32KB FLASH 8MHZ 44TSSOP](/photos/12/32/123222/44x1-tssop_sml.jpg)
ATMEGA32HVB-8X3
Manufacturer Part Number
ATMEGA32HVB-8X3
Description
MCU AVR 32KB FLASH 8MHZ 44TSSOP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32HVB-8X3
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI
Peripherals
POR, WDT
Number Of I /o
17
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4 V ~ 25 V
Data Converters
A/D 7x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TSSOP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI, TWI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
17
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 7 Channel
Package
44TSSOP
Device Core
AVR
Family Name
ATmega
Maximum Speed
8 MHz
Operating Supply Voltage
5|9|12|15|18|24 V
For Use With
ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA32HVB-8X3
Manufacturer:
Atmel
Quantity:
408
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29.4
29.4.1
29.4.2
8042B–AVR–06/10
Read-While-Write and No Read-While-Write Flash Sections
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 soft-
ware 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
6 on page 204
• When erasing or writing a page located inside the RWW section, the NRWW section can be
• When erasing or writing a page located inside the NRWW section, the CPU is halted during the
Note that the user software can never read any code that is located inside the RWW section dur-
ing 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 possible
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 programming is com-
pleted, the RWWSB must be cleared by software before reading code located in the RWW
section. See
details on how to clear RWWSB.
The code located in the NRWW section can be read when the Boot Loader software is updating
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 29-1.
Address During the Programming?
read during the operation.
entire operation.
Which Section does the Z-pointer
NRWW Section
RWW Section
”SPMCSR – Store Program Memory Control and Status Register” on page 206
Read-While-Write Features
and
Figure 29-2 on page
Which Section Can be Read
During Programming?
194. The main difference between the two sections is:
NRWW Section
None
ATmega16HVB/32HVB
Halted?
CPU
Yes
No
Read-While-Write
Supported?
Yes
No
Table 29-
192
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