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14.3 USI Registers
The USI registers are listed in Table 14-1.
Table 14-1. USI Registers
Register Short Form Register Type Address Initial State
USI control register 0 USICTL0 Read/write 078h 01h with PUC
USI control register 1 USICTL1 Read/write 079h 01h with PUC
USI clock control USICKCTL Read/write 07Ah Reset with PUC
USI bit counter USICNT Read/write 07Bh Reset with PUC
USI low byte shift register USISRL Read/write 07Ch Unchanged
USI high byte shift register USISRH Read/write 07Dh Unchanged
The USI registers can be accessed with word instructions as shown in Table 14-2.
Table 14-2. Word Access to USI Registers
Register Short Form High-Byte Register Low-Byte Register Address
USI control register USICTL USICTL1 USICTL0 078h
USI clock and counter control register USICCTL USICNT USICKCTL 07Ah
USI shift register USISR USISRH USISRL 07Ch
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SLAU144J–December 2004–Revised July 2013 Universal Serial Interface (USI)
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