Figure 10.3A Block Diagram Of 8-Bit Serial I/O-1 Pins; Figure 10.3B 8-Bit Serial I/O-1 Registers - Fujitsu F2MC-8L MB89620 Series Hardware Manual

n Block Diagram of 8-bit Serial I/O-1 Pins
SPL: Pin state specification bit in the standby control register (STBC)
Note : Pins with a pull-up resistor (optional) go to the "H" level during a reset or in stop mode (SPL="1").
n 8-bit Serial I/O-1 Registers
SMR1 (Serial 1 mode register)
SDR1 (Serial 1 data register)
R/W: Readable and writable
X : Indeterminate
n 8-bit Serial I/O-1 Interrupt Source
IRQ7: 8-bit serial I/O-1 generates an interrupt request (IRQ7) if interrupt request output is
enabled (SMR1: SIOE = "1") when the I/O function completes input or output of 8 bits of
serial data.
MB89620 series
From output
(SO1 and SCK1 pins only)
PDR
(Port data register)
PDR read
PDR read (for bit manipulation instructions)
Output latch
PDR write
DDR
(Port data direction register)
DDR write
Stop mode (SPL="1")

Figure 10.3a Block Diagram of 8-bit Serial I/O-1 Pins

Address Bit 7 Bit 6 Bit 5
001C SIOF SIOE SCKE
H
R/W R/W R/W
Address Bit 7 Bit 6 Bit 5
001D
H
R/W R/W R/W

Figure 10.3b 8-bit Serial I/O-1 Registers

CHAPTER 10 8-BIT SERIAL I/O (SERIAL I/O-1 AND SERIAL I/O-2)
From the output
To input
enable bit
(SI1 and SCK1 pins only)
(SO1 and SCK1
pins only)
Input buffer
Output buffer
Bit 4 Bit 3 Bit 2 Bit 1
SOE CKS1 CKS0 BDS
R/W R/W R/W R/W
Bit 4 Bit 3 Bit 2 Bit 1
R/W R/W R/W R/W
Pull-up resistor
(optional)
Approx. 50 k Ω /5.0 V
Pin
P33/SI1
P32/SO1
P31/SCK1
Bit 0 Initial value
SST 00000000
B
R/W
Bit 0 Initial value
XXXXXXXX
B
R/W
203
10