HD64F38602R Datasheet, PDF (179/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 9 Timer B1
9.2.2 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. 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. TCB1 is
initialized to H'00.
9.2.3 Timer Load Register B1 (TLB1)
TLB1 is an 8-bit write-only register for setting the reload value of TCB1. Setting the reload value
to TLB1 must be done when bit TMB16 in TMB1 is cleared to 0. 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. TLB1 is initialized to H'00.
Rev. 3.00 May 15, 2007 Page 147 of 518
REJ09B0152-0300