From 18972125e8462b3364c6ac088a6bdd83e3db6ec8 Mon Sep 17 00:00:00 2001 From: AJR Date: Wed, 9 Sep 2020 18:36:57 -0400 Subject: st2xxx.cpp: Update notes --- src/devices/cpu/m6502/st2xxx.cpp | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/src/devices/cpu/m6502/st2xxx.cpp b/src/devices/cpu/m6502/st2xxx.cpp index c890ab5ef15..fc218ef743a 100644 --- a/src/devices/cpu/m6502/st2xxx.cpp +++ b/src/devices/cpu/m6502/st2xxx.cpp @@ -4,15 +4,19 @@ Sitronix ST2XXX LCD MCUs - This extended SoC family combines a 65C02 CPU core (including the - Rockwell bit opcodes) with a wide variety of on-chip peripherals. - Features common to all besides internal RAM and ROM are parallel - ports, internal timers, a multi-level interrupt controller, LCD - controllers (of varying degrees of sophistication), R/C/slow XTAL - clock generators, power management and PSG channels for speaker - output. Each MCU also has numerous pins dedicated to LCD segment - drivers, an external bus addressing several MB of off-chip - memory using multiple chip select signals, or both. + This extended SoC family combines a W65C02S 8-bit CPU core + (including the Rockwell bit opcodes) with a wide variety of on- + chip peripherals. Common features besides internal RAM and ROM are + parallel ports, internal timers, a vectored interrupt controller, + LCD controllers (of varying degrees of sophistication), R/C/slow + XTAL clock generators, power management and PSG channels for + speaker output. Each MCU also has numerous pins dedicated to LCD + segment drivers (ST20XX, ST2104, ST2108), an external bus capable + of addressing several MB of off-chip memory using multiple chip + select signals (ST2100, ST22XX), or both (ST25XX, ST26XX). The + later ST23XX series, targeted mostly at digital greeting card + applications, eliminated on-chip LCD control but retained other + typical ST2XXX features. On all ST2XXX MCUs but the smallest single-chip ST20XX models, 4000–7FFF (nominally program memory) and 8000–FFFF (nominally @@ -23,6 +27,9 @@ switch 4000–7FFF to a different bank during interrupt service if the IRREN bit in the SYS register is set. + At some time between 2010 and 2012, Sitronix spun off all of its + SoC product line to mCore Technology Corporation. + **********************************************************************/ #include "emu.h" -- cgit v1.2.3