Rabbit Rabbit 4000, User Manual

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116 Rabbit 4000 Microprocessor User’s Manual
14.1.2 Registers
14.2 Dependencies
14.2.1 I/O Pins
The output of Timer B does not come out directly on any of the I/O pins. It can be used to
control when the output occurs on Parallel Ports D–E.
14.2.2 Clocks
The timer in Timer B can be clocked by perclk/2, perclk/16, or by countdown timer A1 as
selected in TBCR.
14.2.3 Other Registers
14.2.4 Interrupts
A Timer B interrupt can be generated whenever the counter equals one of the match
registers by enabling the appropriate bit in TBCSR. The interrupt request is cleared when
TBCSR is read.
Register Name Mnemonic I/O Address R/W Reset
Timer B Control/Status Register TBCSR 0x00B0 R/W xxxx0000
Timer B Control Register TBCR 0x00B1 R/W xx000000
Timer B MSB 1 Register TBM1R 0x00B2 R/W xxxxxxxx
Timer B LSB 1 Register TBL1R 0x00B3 R/W xxxxxxxx
Timer B MSB 2 Register TBM2R 0x00B4 R/W xxxxxxxx
Timer B LSB 2 Register TBL2R 0x00B5 R/W xxxxxxxx
Timer B Step LSB 1 Register TBSL1R 0x00BA R/W xxxxxxxx
Timer B Step MSB 1 Register TBSM1R 0x00BB R/W xxxxxxxx
Timer B Step LSB 2 Register TBSL2R 0x00BC R/W xxxxxxxx
Timer B Step MSB 2 Register TBSM2R 0x00BD R/W xxxxxxxx
Timer B Count MSB Register TBCMR 0x00BE R xxxxxxxx
Timer B Count LSB Register TBCLR 0x00BF R xxxxxxxx
Register Function
GCSR Select peripheral clock mode.