Rev. 1.0, 09/02, page 407 of 568
16.2 Input/Output
Pins
Table 16.1 shows the SSU pin configuration.
Table 16.1 Pin Configuration
Name Symbol
I/O
Function
SSU clock
SSCK
I/O
SSU clock input/output
SSU receive data input
SSI
I/O
SSU receive data input/output
SSU transmit data output
SSO
I/O
SSU transmit data input/output
SSU chip select input/output
SCS
I/O
SSU chip select input/output
16.3 Register
Descriptions
The SSU has the following registers.
•
SS control register H (SSCRH)
•
SS control register L (SSCRL)
•
SS mode register (SSMR)
•
SS enable register (SSER)
•
SS status register (SSSR)
•
SS transmit data register 0 to 3 (SSTDR0 to SSTDR3)
•
SS receive data register 0 to 3 (SSRDR0 to SSRDR3)
16.3.1
SS Control Register H (SSCRH)
SSCRH specifies master/slave device selection, bidirectional mode enable, SSO pin output value
selection, SSCK pin selection, and
SCS
pin selection.
Bit
Bit Name
Initial Value
R/W
Description
7 MSS
0
R/W Master/Slave
Device
Selection
Selects that this module is used in master mode
or slave mode. When master mode is selected,
transfer clocks are output from the SSCK pin.
When the CE bit in SSSR is set, this bit is
automatically cleared.
0: Slave mode is selected.
1: Master mode is selected.
Содержание H8S/2627
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