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Ensures timer 2 doesn't use timed behaviour when in pulse mode.

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This commit is contained in:
Thomas Harte 2020-09-17 21:09:32 -04:00
parent 21afc70261
commit 18790a90ae
1 changed files with 9 additions and 2 deletions
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11
Components/6522/Implementation/6522Implementation.hpp
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@ -8,6 +8,10 @@
#include "../../../Outputs/Log.hpp"
// As-yet unimplemented (incomplete list):
//
// PB6 count-down mode for timer 2.
namespace MOS {
namespace MOS6522 {
@ -280,10 +284,13 @@ template <typename T> void MOS6522<T>::do_phase2() {
registers_.timer_needs_reload = false;
registers_.timer[0] = registers_.timer_latch[0];
} else {
registers_.timer[0] --;
-- registers_.timer[0];
}
registers_.timer[1] --;
// Count down timer 2 if it is in timed interrupt mode (i.e. auxiliary control bit 5 is clear).
// TODO: implement count down on PB6 if this bit isn't set.
registers_.timer[1] -= 1 ^ ((registers_.auxiliary_control >> 5)&1);
if(registers_.next_timer[0] >= 0) {
registers_.timer[0] = uint16_t(registers_.next_timer[0]);
registers_.next_timer[0] = -1;