HD64336900G Datasheet, PDF (163/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

10.2.2 Timer Counter B1 (TCB1)
TCB1 is an 8-bit read-only up-counter, which is incremented by internal clock input. The clock
source for input to this counter is selected by bits TMB12 to TMB10 in TMB1. TCB1 values can
be read by the CPU at any time. When TCB1 overflows from H'FF to H'00 or to the value set in
TLB1, the IRRTB1 flag in IRR2 is set to 1. TCB1 is allocated to the same address as TLB1.
10.2.3 Timer Load Register B1 (TLB1)
TLB1 is an 8-bit write-only register for setting the reload value of TCB1. When a reload value is
set in TLB1, the same value is loaded into TCB1 as well, and TCB1 starts counting up from that
value. When TCB1 overflows during operation in auto-reload mode, the TLB1 value is loaded into
TCB1. Accordingly, overflow periods can be set within the range of 1 to 256 input clocks. TLB1
is allocated to the same address as TCB1.
Rev. 1.00, 11/03, page 135 of 376