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| 型号： | MC33912BACR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 84/95页 |
| 文件大小： | 0K |
| 描述： | IC SYSTEM BASIS CHIP 32LQFP |
| 标准包装： | 2,000 |
| 应用： | 系统基础芯片 |
| 电流 - 电源： | 4.5mA |
| 电源电压： | 5.5 V ~ 27 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 带卷 (TR) |
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MC33912BAC / MC34912BAC
FUNCTIONAL DEVICE OPERATIONS
LOGIC COMMANDS AND REGISTERS
MOD2, MOD1 - Mode Control Bits
These write-only bits select the operating mode and allow
clearing the watchdog in accordance with Table 83 Mode
Control Bits.
Table 42. Mode Control Bits
1 = POR Reset has occurred
0 = POR Reset has not occurred
Wake-up Control Register - WUCR
This register is used to control the digital wake-up inputs.
Writing the WUCR will return the Wake-up Status Register
MOD2
0
0
MOD1
0
1
Description
Normal Mode
Stop Mode
(WUSR).
Table 44. Wake-up Control Register - $2
1
1
0
1
Sleep Mode
Normal Mode + Watchdog Clear
Write
C3
L4WE
C2
L3WE
C1
L2WE
C0
L1WE
Voltage Status Register - VSR
Returns the status of the several voltage monitors. This
register is also returned when writing to the Mode Control
Reset
Value
1
1
1
1
Register (MCR).
Table 43. Voltage Status Register - $0/$1
Reset
Condition
POR, Reset mode or ext_reset
S3
S2
S1
S0
LxWE - Wake-up Input x Enable
This write-only bit enables/disables which Lx inputs are
Read
VSOV
VSUV
VDDOT
BATFAIL
enabled. In Stop and Sleep mode the LxWE bit determines
which wake inputs are active for wake-up. If one of the Lx
VSOV - V SUP Over-voltage
This read-only bit indicates an over-voltage condition on the
VS1 pin.
1 = Over-voltage condition.
0 = Normal condition.
VSUV - V SUP Under-Voltage
This read-only bit indicates an under-voltage condition on the
inputs is selected on the analog multiplexer, the
corresponding LxWE is masked to 0.
1 = Wake-Up Input x enabled.
0 = Wake-Up Input x disabled.
Wake-up Status Register - WUSR
This register is used to monitor the digital wake-up inputs and
is also returned when writing to the WUCR.
VS1 pin.
1 = Under-voltage condition.
0 = Normal condition.
Table 45. Wake-up Status Register - $2/$3
S3 S2 S1
S0
VDDOT - Main Voltage Regulator Over-temperature
Read
L4
L3
L2
L1
Warning
This read-only bit indicates that the main voltage regulator
temperature reached the Over-temperature Prewarning
Threshold.
1 = Over-temperature Prewarning
0 = Normal
BATFAIL - Battery Fail Flag.
This read-only bit is set during power-up and indicates that
the 33912 had a Power-On-Reset (POR).
Any access to the MCR or VSR will clear the BATFAIL flag.
Lx - Wake-up input x
This read-only bit indicates the status of the corresponding Lx
input. If the Lx input is not enabled, then the according Wake-
Up status will return 0.
After a wake-up from Stop or Sleep mode these bits also
allow to determine which input has caused the wake-up, by
first reading the Interrupt Status Register (ISR) and then
reading the WUSR.
1 = Lx Wake-up.
0 = Lx Wake-up disabled or selected as analog input.
33912
Analog Integrated Circuit Device Data ?
84
Freescale Semiconductor
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