參數資料
型號: TUSB3410VF
英文描述: BUS CONTROLLER
中文描述: 總線控制器
文件頁數: 23/92頁
文件大?。?/td> 317K
代理商: TUSB3410VF
4
3
Once the code is loaded, the MCU sets SDW = 1. This switches the memory map to normal mode; i.e. the 16K RAM
is mapped to code space, and the MCU starts executing from location 0000h. Once the switch is done, the MCU sets
CONT = 1 (in the USBCTL register). This connects the device to the USB and results in normal USB device
enumeration.
4.1.3
WDCSR: Watchdog Timer, Control, and Status Register (Addr:FF93)
A watchdog timer (WDT) with 1-ms clock is provided. If this register is not accessed for a period of 128 ms, the WDT
counter resets the MCU. (see Figure 5
1). The watchdog timer is enabled by default and can be disabled by writing
a pattern of 101010 into the WDD[5:0] bits.
7
6
5
4
3
2
1
0
ROA
S1
S0
R3
R2
R1
R0
SDW
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W/O
BIT
NAME
RESET
FUNCTION
0
WDT
0
MCU must write a 1 to this bit to prevent the WDT from resetting the MCU. If MCU does not write a 1
in a period of 128 ms, the WDT resets the device. Writing a 0 has no effect on the WDT. (WDT is a
7-bit counter using a 1-ms CLK). This bit is read as 0.
5
1
WDD[5:1]
00000
These bits are used to disable the watchdog timer. For the timer to be disabled these bits must be set
to 10101 and WDD[0] must also be set to 0. If any other pattern is present, the watchdog timer is in
operation.
6
WDR
0
Watchdog reset indication bit. This bit indicates if the reset occurred due to power-on reset or
watchdog timer reset.
WDR = 0
A power-up reset occurred
WDR = 1
A USB reset or watchdog time-out reset occurred. To clear this bit, the MCU must write a 1.
Writing a 0 has no effect.
7
WDD[0]
1
This bit is one of the disable bits for the watchdog timer. This bit must be cleared in order for the
watchdog timer to be disabled.
4.2
Buffers + I/O RAM Map
The address range from F800 to FFFF (2K bytes) is reserved for data buffers, setup packet, endpoint descriptors
block (EDB), and all I/O. There are 128 locations reserved for MMR (memory mapped registers). Table 4
2
represents the XDATA space allocation and access restriction for the DMA, UBM, and MCU.
Table 4
2. XDATA Space
DESCRIPTION
ADDRESS RANGE
UBM ACCESS
DMA ACCESS
MCU ACCESS
Internal MMRs
(Memory Mapped Registers)
FFFF
FF80
No
(Only EDB-0)
No
(only Data reg. and EDB-0)
Yes
EDB
(Endpoint Descriptors Block)
FF7F
FF08
Only for EDB update
Only for EDB update
Yes
Setup Packet
FF07
FF00
Yes
No
Yes
Input Endpoint-0 Buffer
FEFF
FEF8
Yes
Yes
Yes
Output Endpoint-0 Buffer
FEF7
FEF0
Yes
Yes
Yes
Data Buffers
FEEF
F800
Yes
Yes
Yes
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