GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 51

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

GMS81508B/16B/24B
13. SERIAL COMMUNICATION
The serial iterface is used to transmit/receive 8-bit data se-
rially. This consists of serial I/O data register, serial I/O
mode register, clock selection circuit octal counter and
control circuit as illustrated in Figure 13-1.Pin R50/SIN,
R51/SOUT, R52/SCLK and R53/SRDY pins are con-
48
SCLK PIN
SRDY PIN
XIN PIN
SRDY Out
SCK[1:0]
SOUT PIN
“11”
not “11”
8
16
32
Q
SCK[1:0]
R
S
MUX
00
01
10
11
Figure 13-1 SCI Block Diagram
Clock
SRDY In
SIOST
Start
CONTROL CIRCUIT
Input shift register
Internal bus line
trolled by the Serial Mode Register. The contents of the Se-
rial I/O data register can be written into or read out by
software. The data in the Serial Data Register can be shift-
ed synchronously with the transfer clock signal.
SIOR
Complete
Complete
SIOSF
Clock
Shift
[0EB
H
]
overflow
Counter
Octal
HYUNDAI MicroElectronics
Serial communication
Interrupt
DEC. 1999 Ver 1.04
SIOIF
SIN PIN