gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 63

• Manufacturer Part Number: gc80c510
• Description: Eprom/rom 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

MiDAS1.1 Family
detected and shifted into the SBUF.
and RI is set. However certain conditions must be met before the loading and setting of RI can be done.
Otherwise the received frame may be lost. After the middle of the stop bit, the receiver goes back to
looking for a 1-to-0 transition on the RXD pin.
Figure 6-11 UART Mode 1
After shifting in 8-bit data, there is one more shift to do, after which the SBUF and RB8 are loaded
If these conditions are met and the stop bit goes to RB8, the 8-bit data go into SBUF and RI is set.
1.
2.
SMOD
RI must be 0 and
the received stop bit = 1
Overflow
Timer 1
1/2
0
1
Write to
RXD
SBUF
Transition
Detector
1-to-0
1/16
Read SBUF
Load SBUF
Sample
Serial Port
Interrupt
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D
CL
“0”
Bit Detector
S
Q
START
TX CLOCK
START
RX CLOCK
Internal BUS
Internal BUS
1/16
RX CONTROL
Zero Detector
TX CONTROL
Input Shift Register
SBUF
SBUF
SHIFT
1FFh
TI
RI
(9 bits)
SHIFT
LOAD
DATA
SEND
SBUF
Shift
TXD