Rainbow Electronics 78M6631 - Manual (Page 13)

DS_6631_056 78M6631 Data Sheet
Rev 1 13
Table 1: SPI Command Description
Command Description
11xx xxxx ADDR D0 ... DN Output data on PSDO is read from RAM starting with byte at ADDR.
ADDR auto increments until PCSZ is raised.
MPU SPI interrupt is generated.
1100 0000 ADDR D0 ... DN Output data on PSDO is read from RAM starting with byte at ADDR.
ADDR auto increments until PCSZ is raised.
No MPU SPI interrupt is generated.
10xx xxxx ADDR D0 ... DN Input data on PSDI is written to RAM starting with byte at ADDR.
ADDR auto increments until PCSZ is raised.
MPU SPI interrupt is generated.
1000 0000 ADDR D0 ... DN Input data on PSDI is written to RAM starting with byte at ADDR.
ADDR auto increments until PCSZ is raised.
No MPU SPI interrupt is generated.
CMD ADDR D0 ... DN CMD and ADDR are available to the CPU in IORAM.
D0… DN are ignored.
MPU SPI interrupt is generated.
A15 A14 A1 A0 C0
0 31
x
D7 D6 D1 D0 D7 D6 D1 D0
C5 C6 C7 x
PCSZ
PSCK
PSDI
PSDO
8 bit CMD 16 bit Address DATA[ADDR] DATA[ADDR+1]
7 8 23 24 32 39
Extended Read . . .
SERIAL READ
A15 A14 A1 A0 C0
0 31
C5 C6 C7 x
PCSZ
PSCK
PSDI
PSDO
8 bit CMD 16 bit Address DATA[ADDR] DATA[ADDR+1]
7 8 23 24 32 39
Extended Write . . .
SERIAL WRITE
D7 D6 D1 D0 D7 D6 D1 D0 x
HI Z
HI Z
(From Host)
(From 6531)
(From Host)
(From 6531)
Figure 4: SPI Slave Port: Typical Read and Write Operations
Since the addresses are in 16-bit format, any type of XRAM data can be accessed: CE, MPU, or IORAM
but not SFRs or the 80515-internal register bank.
1.19 Test Port
One out of 16 digital or eight analog signals can be selected to be output on the TMUXOUT pin. Refer to
the 78M6631 Programmer’s Reference Manual for more information regarding the use of TMUXOUT.
1.20 UART
The 78M6631 includes one UART (UART0) that can be programmed to communicate with a variety of
external devices. The UART is a dedicated 2-wire serial interfaces (no hardware flow
control/handshaking), which can communicate at rates up to 38,400 bps. All UART transfers are
programmable for parity enable, parity, 2 stop bits/1 stop bit and XON/XOFF options for variable
communication baud rates from 300 to 38,400 bps. Refer to the 78M6631 Programmer’s Reference
Manual for more information regarding the use of the UART resources.