參數(shù)資料
型號(hào)： ADUC7034BCPZ-RL
廠商： Analog Devices Inc
文件頁數(shù)： 34/136頁
文件大小： 0K
描述： IC MCU FLASH 32K ANLG IO 48LFCSP
標(biāo)準(zhǔn)包裝： 2,500
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 20.48MHz
連通性： LIN，SPI，UART/USART
外圍設(shè)備： POR，PSM，溫度傳感器，WDT
輸入/輸出數(shù)： 9
程序存儲(chǔ)器容量： 32KB（16K x 16）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 1K x 32
電壓 - 電源 (Vcc/Vdd)： 3.5 V ~ 18 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 2x16b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 115°C
封裝/外殼： 48-VFQFN 裸露焊盤，CSP
包裝： 帶卷 (TR)
ADuC7034
Rev. B | Page 129 of 136
TRANSMIT DATA
TO MASTER
TRANSMIT SECOND
PARITY BIT
RECEIVE DATA
FROM MASTER
RECEIVE SECOND
PARITY BIT
RECEIVE
SYNCHRONIZATION
PULSES
RECEIVE
DIRECTION
BIT
RECEIVE
SLAVE
ADDRESS
RECEIVE
REGISTER
ADDRESS
RECEIVE FIRST
PARITY BIT
TRANSMIT
ACK/NACK
INITIALIZE BSD
HARDWARE/
SOFTWARE
07
11
6-
05
2
BSD DATA TRANSMISSION
User code forces the GPIO_12 signal low for a specified time to
transmit data in BSD mode. In addition, user code uses the sync
timer (LHSVAL0), the LHS sync capture register (LHSCAP), and
the LHS sync compare register (LHSCMP) to determine the time
that the BSD bus should be held low for bit transmissions in the
0 or 1 state.
As described in the BSD Example Pulse Widths section, even
when the slave is transmitting data, the master always starts the
bit transmission period by pulling the BSD bus low. If BSD
mode is selected (LHSCON0[6] = 1), the LIN sync timer value
is captured in LHSCAP on every falling edge of the BSD bus.
The LIN sync timer runs continuously in BSD mode.
Then, user code can immediately force GPIO_12 low and read the
captured timer value from LHSCAP. Next, the user can calculate
how many clock periods (with a 5 MHz clock) should elapse before
the GPIO_12 is driven high for a pulse width in the 0 or 1 state.
The calculated number can be added to the LHSCAP value and
written into the LHSCMP register. If LHSCON0[5] is set, the sync
timer, which continues to count (being clocked by a 5 MHz clock),
eventually equals the LHSCMP value and generates an LHS
compare interrupt (LHSSTA[3]).
The response to this interrupt should be to force the GPIO_12
signal and therefore the BSD bus high. The software control
of the GPIO_12 signal, along with the correct use of the LIN
synchronization timers, ensures that valid pulse widths in the
0 and 1 states can be transmitted from the ADuC7034, as shown
in Figure 58. However, care needs to be taken if switching from
BSD write mode to BSD read mode, as described in Table 92
(see the LHSCON0[8] bit).
Figure 56. BSD Slave Node State Machine
BSD DATA RECEPTION
BSD PERIOD
IN 0 STATE
BSD PERIOD
IN 1 STATE
LHSVAL0 LOADED
INTO LHSCAP HERE
2
MASTER DRIVES
BSD BUS LOW
1
SOFTWARE ASSERTS
BSD LOW HERE
3
SOFTWARE DEASSERTS
BSD HIGH HERE
5
LHSCMP = LHSVAL0
INTERRUPT GENERATED
HERE
4
07116-
054
To receive data, the LIN/BSD peripheral must first be con-
figured in BSD mode where LHSCON[6] = 1. In this mode,
LHSCON0[8] should be set to ensure that the LHS break timer
(see the LIN Hardware Break Timer1 Register section) generates
an interrupt on the rising edge of the BSD bus.
The LHS break timer is cleared and starts counting on the falling
edge of the BSD bus; the timer is subsequently stopped and
generates an interrupt on the rising edge of the BSD bus. Given
that the LHS break timer is clocked by the low power 131 kHz
oscillator, the value in LHSVAL1 can be interpreted by user code
to determine if the received data bit is a BSD sync pulse, 0, or 1.
Figure 58. Master Read, Slave Transmit
WAKE UP FROM BSD INTERFACE
The MCU core can be woken up from power-down via the BSD
physical interface. Before entering power-down mode, user
code should enable the start condition interrupt (LHSCON0[3]).
When this interrupt is enabled, a high-to-low transition on the
LIN/BSD pin generates an interrupt event and wakes up the
MCU core.
BSD PERIOD
IN 0 STATE
BSD PERIOD
IN 1 STATE
LHSVAL1 CLEARED
AND STARTS COUNTING
ON THIS EDGE
1
LHSVAL1 STOPPED
AND GENERATES
INTERRUPT ON THIS EDGE
2
07
11
6-
0
5
3
Figure 57. Master Transmit, Slave Read
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