Determination Of Signal Type By Low/High-Level Period - Renesas H8S/2100 Series Hardware Manual

Section 16 CIR Interface
16.4.1

Determination of Signal Type by Low/High-Level Period

The signal type is determined by low/high-level period that is specified in the HHMIN, HHMAX,
HLMIN, HLMAX, DT1MIN, DT1MAX, DT0MIN, DT0MAX, RMIN, and RMAX registers.
Calculating formula for specified time, setting examples of each maximum/minimum value
register during the specified time, and use for each register are described as follows. The symbols
in table 16.4 correspond to the ones used in the figure 16.3 to figure 16.5.
S.E = M (N + 1)/T
S: Specified time of the NEC format
E: Error from the NEC format
T: Frequency of the reference clock (Hz) set by the CLK1 and CLK0 bits in CCR1
(φ, φ/2, φ/4, or φsub)
N: Setting value in BRR (0 ≤ N ≤ 255)
M: Value in the maximum/minimum value setting register
Rev. 1.00 Apr. 28, 2008 Page 484 of 994
REJ09B0452-0100