M16C26A Datasheet, PDF (328/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
19. Usage Notes
19.7.2 Timer B
19.7.2.1 Timer B (Timer Mode)
1. The timer remains idle after reset. Set the mode, count source, counter value, etc. using the TBiMR
(i = 0 to 2) register and TBi register before setting the TBiS bit in the TABSR register to “1” (count
starts).
Always make sure the TBiMR register is modified while the TBiS bit remains “0” (count stops)
regardless whether after reset or not.
2. The counter value can be read out at any time by reading the TBi register. However, if this register
is read at the same time the counter is reloaded, the read value is always “FFFF16.” If the TBi
register is read after setting a value in it but before the counter starts counting, the read value is the
one that has been set in the register.
19.7.2.2 Timer B (Event Counter Mode)
1. The timer remains idle after reset. Set the mode, count source, counter value, etc. using the TBiMR
(i = 0 to 2) register and TBi register before setting the TBiS bit in the TABSR register to “1” (count
starts).
Always make sure the TBiMR register is modified while the TBiS bit remains “0” (count stops)
regardless whether after reset or not.
2. The counter value can be read out at any time by reading the TBi register. However, if this register
is read at the same time the counter is reloaded, the read value is always “FFFF16.” If the TBi
register is read after setting a value in it but before the counter starts counting, the read value is the
one that has been set in the register.
Rev. 2.00 Feb.15, 2007 ^{page 311} of 329
REJ09B0202-0200