參數(shù)資料
型號: μPD789800
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 18/48頁
文件大?。?/td> 266K
代理商: ΜPD789800
18
μ
PD789800
Figure 5-5. Block Diagram of USB Function
Internal bus
Internal bus
USBDP
USBDM
Each handshake packet
SYNC packet
USB clock
Overflow
INTUSBTM
f
X
INTUSBRD
Start
USB receiver enable
register (USBMOD)
Counter
Transmit reservation
registers
(HTXRSV, DTXRSV)
Transmit/receive pointers
(USBPOB, USBPOW)
Remote wake-up
control register
(REMWUP)
EOP
generation/detection
resume & reset
detection control
SYNC detection/USB
clock generator
USB timer
(7-bit counter)
USB timer start
reservation control
register (USBTCL)
Receive result storage
register (DRXRSL)
Packet receive status
register (RXSTAT)
CRC
circuit
ENDP
detection
circuit
Compare register
Receive buffer
Transmit buffer
Bit stuff/bit strip
control circuit
Receive bank
switching ID
detection buffer
NRZI
encoder
Output
latch
S
Data/handshake packet
receive mode register
(URXMOD)
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