diff options
Diffstat (limited to 'src/devices/cpu/h8/h8_watchdog.cpp')
-rw-r--r-- | src/devices/cpu/h8/h8_watchdog.cpp | 77 |
1 files changed, 52 insertions, 25 deletions
diff --git a/src/devices/cpu/h8/h8_watchdog.cpp b/src/devices/cpu/h8/h8_watchdog.cpp index 0bab0b3267b..a8af865f2ab 100644 --- a/src/devices/cpu/h8/h8_watchdog.cpp +++ b/src/devices/cpu/h8/h8_watchdog.cpp @@ -1,12 +1,27 @@ +// license:BSD-3-Clause +// copyright-holders:Olivier Galibert +/*************************************************************************** + + h8_watchdog.cpp + + H8 watchdog/timer + + TODO: + - add RSTCSR for MCUs that have it (reset is only enabled when RSTI is 1) + - It will only clear the overflow flag when writing 0 after reading it + when it's set? It's how the databook explains it, similar to HD6301. + +***************************************************************************/ + #include "emu.h" #include "h8_watchdog.h" DEFINE_DEVICE_TYPE(H8_WATCHDOG, h8_watchdog_device, "h8_watchdog", "H8 watchdog") -const int h8_watchdog_device::div_bh[8] = { 1, 6, 7, 9, 11, 13, 15, 17 }; -const int h8_watchdog_device::div_s [8] = { 1, 5, 6, 7, 8, 9, 11, 12 }; +const int h8_watchdog_device::div_bh[8] = { 1, 5, 6, 7, 8, 9, 11, 12 }; +const int h8_watchdog_device::div_s [8] = { 1, 6, 7, 9, 11, 13, 15, 17 }; -h8_watchdog_device::h8_watchdog_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : +h8_watchdog_device::h8_watchdog_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, H8_WATCHDOG, tag, owner, clock), m_cpu(*this, finder_base::DUMMY_TAG), m_intc(*this, finder_base::DUMMY_TAG) @@ -14,31 +29,38 @@ h8_watchdog_device::h8_watchdog_device(const machine_config &mconfig, const char } -uint64_t h8_watchdog_device::internal_update(uint64_t current_time) +u64 h8_watchdog_device::internal_update(u64 current_time) { tcnt_update(current_time); if(m_tcsr & TCSR_TME) { int shift = (m_type == S ? div_s : div_bh)[m_tcsr & TCSR_CKS]; - uint64_t spos = m_tcnt_cycle_base >> shift; + u64 spos = m_tcnt_cycle_base >> shift; return (spos + 0x100 - m_tcnt) << shift; - } else return 0; } -void h8_watchdog_device::tcnt_update(uint64_t cur_time) +void h8_watchdog_device::notify_standby(int state) +{ + if(state) + tcnt_update(); + else + m_tcnt_cycle_base = m_cpu->total_cycles(); +} + +void h8_watchdog_device::tcnt_update(u64 cur_time) { if(m_tcsr & TCSR_TME) { int shift = (m_type == S ? div_s : div_bh)[m_tcsr & TCSR_CKS]; if(!cur_time) cur_time = m_cpu->total_cycles(); - uint64_t spos = m_tcnt_cycle_base >> shift; - uint64_t epos = cur_time >> shift; + u64 spos = m_tcnt_cycle_base >> shift; + u64 epos = cur_time >> shift; - int next_tcnt = m_tcnt + int(epos - spos); + u64 next_tcnt = m_tcnt + (epos - spos); m_tcnt = next_tcnt; m_tcnt_cycle_base = cur_time; - // logerror("%10lld tcnt %02x -> %03x shift=%d\n", cur_time, m_tcnt, next_tcnt, shift); + //logerror("%10lld tcnt %02x -> %03x shift=%d\n", cur_time, m_tcnt, next_tcnt, shift); if(next_tcnt >= 0x100) { if(m_tcsr & TCSR_WT) { @@ -56,17 +78,18 @@ void h8_watchdog_device::tcnt_update(uint64_t cur_time) } } else m_tcnt = 0; - } -uint16_t h8_watchdog_device::wd_r() +u16 h8_watchdog_device::wd_r() { if(!machine().side_effects_disabled()) tcnt_update(); - return (m_tcsr << 8) | m_tcnt; + + u8 tcsr_mask = m_type == B ? 0x10 : 0x18; + return ((m_tcsr | tcsr_mask) << 8) | m_tcnt; } -void h8_watchdog_device::wd_w(offs_t offset, uint16_t data, uint16_t mem_mask) +void h8_watchdog_device::wd_w(offs_t offset, u16 data, u16 mem_mask) { if(mem_mask != 0xffff) return; @@ -75,8 +98,7 @@ void h8_watchdog_device::wd_w(offs_t offset, uint16_t data, uint16_t mem_mask) tcnt_update(); if(!(m_tcsr & TCSR_TME) && (data & TCSR_TME)) m_tcnt_cycle_base = m_cpu->total_cycles(); - m_tcsr = data & 0xff; - m_tcsr |= m_type == B ? 0x10 : 0x18; + m_tcsr = (m_tcsr & data & TCSR_OVF) | (data & 0x7f); m_cpu->internal_update(); } @@ -84,21 +106,26 @@ void h8_watchdog_device::wd_w(offs_t offset, uint16_t data, uint16_t mem_mask) if(m_tcsr & TCSR_TME) { m_tcnt = data & 0xff; m_tcnt_cycle_base = m_cpu->total_cycles(); - // logerror("%10lld tcnt = %02x\n", m_tcnt_cycle_base, m_tcnt); + //logerror("%10lld tcnt = %02x\n", m_tcnt_cycle_base, m_tcnt); } m_cpu->internal_update(); } } -uint16_t h8_watchdog_device::rst_r() +u16 h8_watchdog_device::rst_r() { if(!machine().side_effects_disabled()) logerror("rst_r\n"); - return 0; + + u8 rst_mask = m_type == S ? 0x1f : 0x3f; + return m_rst | rst_mask; } -void h8_watchdog_device::rst_w(uint16_t data) +void h8_watchdog_device::rst_w(offs_t offset, u16 data, u16 mem_mask) { + if(mem_mask != 0xffff) + return; + if((data & 0xff00) == 0xa500) logerror("wowf_w %02x\n", data & 0xff); if((data & 0xff00) == 0x5a00) @@ -108,15 +135,15 @@ void h8_watchdog_device::rst_w(uint16_t data) void h8_watchdog_device::device_start() { save_item(NAME(m_tcnt)); - save_item(NAME(m_tcnt_cycle_base)); save_item(NAME(m_tcsr)); save_item(NAME(m_rst)); + save_item(NAME(m_tcnt_cycle_base)); } void h8_watchdog_device::device_reset() { - m_tcnt = 0x00; m_tcnt_cycle_base = m_cpu->total_cycles(); - m_tcsr = m_type == B ? 0x10 : 0x18; - m_rst = m_type == S ? 0x1f : 0x3f; + m_tcnt = 0x00; + m_tcsr = 0x00; + m_rst = 0x00; } |