M37532M4 Datasheet, PDF (22/50 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
7532 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Universal serial bus (USB) mode
By setting bits 7 and 6 of the serial I/O1 control register (address
001A16) to “11”, the USB mode is selected.
This mode conforms to “Low Speed device” of USB Specification
1.0. In this mode serial I/O1 interrupt have 5 sources; USB in and
out token receive, USB reset, suspend, and resume. The USB
status/UART status register functions as the USB status register
(USBSTS).There is the USBVREFOUT pin for the USB reference
voltage output, and a D-line with 1.5 kΩ external resistor can be pull
up. USB mode block and USB transceiver block show in figures 24
and 25.
XIN
6 MHz
Digital
PLL
P10/D-
P11/D+
USB
transceiver
Differential input and
Single end input
Output data and
I/O control
USB transmit unit
1.5 MHz
Data bus
Address 001816
Receive buffer register
RxRDY
NRZI,
bit stuffing decoder
Bus state
detection
BSTFE
EOP
Reset interrupt request
Suspend interrupt request
Resume interrupt request
Receive shift register
SYNC decoder
PID decoder
PIDE
RxPID
OPID
Address
comparative unit
End pointer
decoder
USBA
RxEP
CRC check
Token interrupt request
NRZI,
bit stuffing encoder
EOP generating unit
CRC encoder
Data bus
CRCE
Transmit shift register
Transmit buffer register
Address 001816
SYNC, PID
generating unit
TxRDY
EP0BYTE
EP1BYTE
EP0PID
EP1PID
Fig. 24 USB mode block diagram
Serial I/O1 control register
MOD0
MOD1
USB control register
USBVREFOUT output valid flag
(initial value “0”)
Output enable signal
Voltage input
USB reference
power source voltage
Voltage input
Internal D- output signal
Internal D+ output signal
Output amplifier
D+/D-
output amplifier
Suspend
Signal for function stop
OE _{Output enable signal}
(internal signal)
Differential input
-
+
Single end input
Single end input
Fig. 25 USB transceiver block diagram
USBVREFOUT
D-
D+
22