參數(shù)資料
型號: M38C59MF-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80
文件頁數(shù): 29/75頁
文件大小: 995K
代理商: M38C59MF-XXXHP
Rev.2.00
Nov 23, 2005
page 35 of 73
REJ03B0028-0200
38C5 Group
1/4
F/F
Serial I/O1 status register
Serial I/O1 control register
φSOURCE
Receive buffer register
Address 001816
Receive shift register
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Clock control circuit
Shift clock
Serial I/O1 synchronous
clock selection bit
Frequency division ratio 1/(n+1)
Baud rate generator
Address 001C16
BRG count source selection bit
Clock control circuit
Falling-edge detector
Transmit buffer register
Data bus
Address 001816
Shift clock
Transmit shift completion flag (TSC)
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
Transmit interrupt source selection bit
Address 001916
Data bus
Address 001A16
Transmit shift register
P40/RXD
P42/SCLK1
P43/SRDY1
P41/TXD
φ SOURCE:represents the supply source of internal clock φ.
XIN input: in the middle- or high-speed mode,
Internal on-chip oscillator divided by 4 in the on-cihp oscillator mode, and
Sub clock in the low-speed mode.
SERIAL INTERFACE
q Serial I/O1
Serial I/O1 can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer is also provided for baud
rate generation.
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O1 mode can be selected by setting the
serial I/O mode selection bit of the serial I/O1 control register to “1”.
For clock synchronous serial I/O1, the transmitter and the receiver
must use the same clock. If an internal clock is used, transfer is
started by a write signal to the TB/RB.
Fig. 30 Block diagram of clock synchronous serial I/O1
Fig. 31 Operation of clock synchronous serial I/O1 function
D7
D0
D1
D2
D3
D4
D5
D6
D0
D1
D2
D3
D4
D5
D6
RBF = 1
TSC = 1
TBE = 0
TBE = 1
TSC = 0
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
Serial output TxD
Serial input RxD
Write pulse to receive/transmit
buffer register
Overrun error (OE)
detection
Notes 1: As the transmit interrupt (TI) source, which can be selected, either when the transmit buffer has emptied (TBE = 1) or
after the transmit shift operation has ended (TSC = 1), by setting the transmit interrupt source selection bit (TIC) of the
serial I/O1 control register.
2: If data is written to the transmit buffer register when TSC=0, the transmit clock is generated continuously and serial data
is output continuously from the TxD pin.
3: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1” .
Receive enable signal SRDY
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