I'm glad I'm not alone here! It seems that Toshiba just don't do it that way. I generally find that without using an MCU, a 555 is the easiest way to create a square wave clock, care to enlighten me otherwise?
On the few occasions I need just a dumb constant square wave, well -- these days, there's those LT TimerBlox.. if you don't mind the extra buck. Otherwise, I'll do a number of things; breadboarding, I might use a two transistor multivibrator, or a hysteresis comparator (same thing as a 555, but only needs one comparator -- albeit a pile of resistors around it). The latter also generates a crude ramp, which leads into PWM (you can do (linear, constant frequency) PWM with a single 556, but I can do it with
a single LM393).
By and large, I don't need constant frequency square waves; when it comes to switching supplies, most of mine look like either a two loop PWM system, or a variable astable with peak current mode control (
something like a UC3842, with the oscillator supply strapped to the COMP pin -- so frequency is variable, keeping idle current down).
Tim